ProSoft Organic Cotton Interlock ECO-PUL: The Complete Guide to Wazoodle's Smooth Organic Waterproof Fabric

What ProSoft Organic Cotton Interlock ECO-PUL Is and Why It Matters

ProSoft Organic Cotton Interlock ECO-PUL is a dual-function waterproof laminate that bonds 1 mil polyurethane film to an organic cotton interlock base using ECO-Thermal Bonding Technology (permanent film fusion independently tested 50% stronger than competitor US-made PUL). At 245–255 GSM with a waterproof barrier rated at more than 100× any normal use pressure and breathability matched to resting body moisture output, this fabric provides absorbent organic cotton on one side and a complete waterproof barrier on the reverse — combining two functions into a single layer that simplifies product construction.

The organic cotton interlock base (80% organic cotton via US Cotton Trust Protocol, 20% polyurethane) delivers a smooth, soft face suitable for direct skin or food contact, while the interlock knit structure eliminates the edge curling common in jersey-based PUL. ProSoft Organic Cotton Interlock ECO-PUL features Waterproof 300X Technology (rated waterproof integrity through 300+ wash cycles) and SilentFlex Technology (quiet fabric-like drape). CPSIA certified, Forever Chemicals-Free (no PFAS, BPA, phthalates). Made in USA by AKAS Tex.

For detailed technology explanations, see ProSoft ECO-Thermal Bonding Technology Discovery and ProSoft Waterproof 300X Technology Discovery.

The Complete ProSoft Organic Cotton Interlock ECO-PUL Lineup: Standard, Silver, and FoodSAFE Variants

ProSoft Organic Cotton Interlock ECO-PUL comes in three variants sharing the same organic cotton interlock + PUL construction, separated by antimicrobial treatment and food-contact certification. Your only decisions are whether your project needs antimicrobial odor control or FDA food-contact certification.

Standard
  • W-389 — ProSoft Organic Cotton Interlock Waterproof ECO-PUL Fabric: 245 GSM, 55–60" width, 0.032" thickness. 80% organic cotton / 20% polyurethane interlock base with ECO-Thermal Bonding Technology (permanent film fusion independently tested 50% stronger than competitor US-made PUL) and Waterproof 300X Technology (300+ wash cycle durability). UPF 50+ UV protection. Available in Natural colorway.
Silver Antimicrobial
FoodSAFE
  • W-681 — ProSoft FoodSAFE Organic Cotton Interlock Waterproof PUL Fabric: 255 GSM, 55–60" width, 0.032" thickness. Identical base construction with FDA food-contact certification (21 CFR 175.300 and 177.1680 — certified for direct contact with all food types from freezer storage at -20°C to 150°F). Both fabric and film sides tested safe for food contact. Available in Natural colorway.
Key Concept — Dual-Function Construction: ProSoft Organic Cotton Interlock ECO-PUL provides absorbent organic cotton on one side and waterproof barrier on the reverse. This dual-function design can simplify product builds by combining the skin-contact or food-contact layer and waterproof barrier into a single fabric — reducing component layers in diaper covers, changing pads, and food storage products.

All fabric specifications may vary ±10% due to textile industry manufacturing standards.

Choosing Your ProSoft Organic Cotton Interlock ECO-PUL: Standard vs Silver vs FoodSAFE

ProSoft Organic Cotton Interlock ECO-PUL's three variants share the same waterproof barrier, breathability, and Waterproof 300X durability (300+ wash cycles). Your choice depends on whether your project needs antimicrobial odor control or FDA food-contact certification.

When Standard (W-389) Is the Right Choice
  • Regular-wash baby products: Cloth diaper covers, changing pad covers, wet bags, and baby accessories laundered after each use — Standard provides full waterproof performance at the best value.
  • Chemical-sensitivity applications: Standard contains no antimicrobial treatment — the preferred choice for users requiring completely untreated organic cotton against skin.
  • Bag linings and general waterproofing: Diaper bag interiors and protective linings where organic waterproofing is needed without food-contact or antimicrobial requirements.
When Silver (W-522) Is the Right Choice
  • Extended wear between washes: All-in-one diaper construction, incontinence products, and mattress protectors where Silver Plus odor control adds value during prolonged use.
  • Odor-sensitive environments: Pet bed liners and applications where biological odors develop between washings — Silver Plus inhibits bacterial growth but does not replace laundering.
When FoodSAFE (W-681) Is the Right Choice
  • Reusable food storage: Sandwich wraps, snack bags, bowl covers, bread bags, and lunch bag linings requiring FDA food-contact certification. Customer reports confirm effective food freshness preservation and strong durability.
  • Baby products with oral contact: Bibs and burp cloths where FDA certification provides documented safety for products contacting a baby's mouth.

Bleach restrictions vary by variant: Never use chlorine bleach on any variant — chlorine damages the polyurethane laminate. W-522 Silver additionally cannot tolerate oxygen bleach (degrades Silver Plus treatment). W-389 Standard tolerates non-chlorine oxygen bleach sparingly.

For comparing this fabric against other ProSoft PUL types, see Choosing Between ProSoft PUL Types (DF-005). For Standard vs Silver across all Wazoodle fabrics, see Standard vs Silver: When Antimicrobial Treatment Matters.

Working With ProSoft Organic Cotton Interlock ECO-PUL: Sewing and Construction Guide

ProSoft Organic Cotton Interlock ECO-PUL sews on standard domestic machines with the right setup. The organic cotton interlock base provides a key advantage over jersey-based PUL — edges stay flat without curling, making cutting and layout more accurate. The fabric arrives cut-and-sew ready with no pre-washing required.

Cutting and Layout
  • Flat-edge advantage: The interlock knit base eliminates the edge curling common in jersey-based PUL — edges lay flat for accurate pattern cutting without clips or weights to manage curl.
  • Mark on fabric side only: Mark patterns on the organic cotton face, not the polyurethane film side, to avoid surface damage. Cut with sharp scissors or rotary cutter — edges do not fray significantly due to interlock construction.
  • Shrinkage planning: Expect 1–2% shrinkage in both directions on first wash — minimal pattern adjustment needed.
Sewing Recommendations
  • Needles: Use ballpoint/jersey needles (sizes 75/11 or 80/12) — sharp needles slice knit yarns and create enlarged holes that leak.
  • Presser foot: Use a Teflon/glide foot or walking foot — the polyurethane film sticks to standard presser feet. Alternatives: sew through wax paper (tear away after) or dab minimal machine oil on the foot.
  • Thread: Quality polyester thread (Tex-27 or 65/2 grade) exclusively — cotton and rayon wick moisture through needle holes, defeating the barrier.
  • Orientation: Sew with the film side down against feed dogs — teeth grip the slippery surface while the cotton face rides smoothly under the foot.

Critical — Seam Sealing Required: Every needle hole through the polyurethane film permanently compromises waterproofing. Use clips instead of pins, plan stitching lines carefully, and apply heat-activated seam sealing tape over all sewn seams to restore the barrier. Tape is a sealant applied after stitching, not a structural replacement for sewing.

Pairing ProSoft Organic Cotton Interlock ECO-PUL With Other Wazoodle Fabrics

ProSoft Organic Cotton Interlock ECO-PUL's dual-function construction means it can serve as both the waterproof layer and the skin-contact or food-contact surface in many products without additional layers. Pairing decisions focus on what absorbent core sits between the cotton face and the waterproof backing.

Absorbent Core Partners (Between Cotton Face and PUL Barrier)
  • Zorb Original (W-202): Thin, high-capacity absorbent interlining with Hydro-Dual Fiber Technology (rapid liquid capture and distribution). Zorb Original must be enclosed between fabric layers — the organic cotton face of this PUL can serve as one enclosure layer.
  • Zorb 3D Organic Cotton Dimple (W-231): Standalone organic absorbent with Zorb 3D Fiber Technology (dimensional moisture distribution) for compression-resistant absorption. Pairs with this PUL's waterproof backing beneath.
  • ProECO Organic Cotton Fleece (W-244): Additional organic absorbent layer for all-organic product builds where natural fiber content throughout the stack is the priority.
Proven Layer Stack Configurations
  • ProSoft Organic Cotton Interlock ECO-PUL (W-389) as standalone cover: Organic cotton face serves as exterior while PUL film faces inward toward absorbent inserts. Common for cloth diaper covers and changing pad surfaces where dual-function construction eliminates a separate waterproof layer.
  • Zorb Original (W-202) → ProSoft Organic Cotton Interlock ECO-PUL (W-389): Zorb absorbent core with organic cotton PUL as combined barrier and outer surface. The cotton face encloses one side of the Zorb while PUL film provides waterproofing beneath.
  • ProSoft FoodSAFE Organic Cotton Interlock PUL (W-681) + Cotton Exterior: FoodSAFE PUL as interior food-contact lining with decorative cotton outer shell — for reusable snack bags, sandwich wraps, and bowl covers.

Your results may vary based on product design, construction method, and end-use requirements.

For complete layer guidance and build patterns, see the Application Discovery articles for Cloth Diapers, Diaper Covers, Reusable Food Storage Bags, and Baby Changing Pads.

Common Applications for ProSoft Organic Cotton Interlock ECO-PUL

ProSoft Organic Cotton Interlock ECO-PUL serves as the waterproof barrier — or combined barrier-plus-surface layer — in products requiring organic cotton content with complete liquid containment. Its dual-function construction simplifies builds across baby products, food storage, medical applications, and beyond.

Cloth diaper covers and baby accessories use this as the waterproof outer layer with organic cotton face for diaper covers, wet bags, and changing pad covers. Customer reports describe the fabric as "heavy duty" with durability exceeding expectations for organic materials. Also used for sensory comfort items including teddy bear ears designed for pacifier weaning, where safety, softness, and washability matter for prolonged oral contact.

Reusable food storage uses the FoodSAFE variant (W-681) for sandwich wraps, snack bags, bowl covers, and bread storage bags. Customer reports confirm strong durability through repeated food storage use and effective freshness preservation. Makers report easy sewing for food wrap construction.

Incontinence and medical products use this as waterproof backing for adult pads, underpads, mattress protectors, and examination table covers. Silver variant (W-522) recommended for odor management in extended-use applications.

Bag construction uses the interior waterproof lining for diaper bags and general bag projects where organic waterproof protection is needed on the inside surface.

Underarm sweat guards use waterproof gussets sewn into lightweight undergarments to protect clothing from perspiration while the organic cotton face provides skin-friendly direct body contact.

Castor oil packs use this as a waterproof barrier for wellness applications requiring skin-safe materials with liquid containment properties. Both Standard (W-389) and FoodSAFE (W-681) variants used by customers for this application.

For complete build guidance, see the Application Discovery articles for Cloth Diapers, Diaper Covers, Reusable Food Storage Bags, Incontinence Pads, and Bed Pads & Waterproof Protectors.

ProSoft Organic Cotton Interlock ECO-PUL Certifications: CPSIA, Organic, Chemical-Free, and Made in USA

ProSoft Organic Cotton Interlock ECO-PUL (all three variants) is certified safe for children's products and verified free of harmful chemicals. W-681 FoodSAFE additionally carries FDA food-contact certification for direct contact with all food types.

Safety Certifications
  • CPSIA Certified: Consumer Product Safety Improvement Act — mandatory U.S. federal standard for children's products including lead, phthalate, and flammability requirements
  • FDA Food-Contact Certified (W-681 only): 21 CFR 175.300 and 177.1680 — certified for direct food contact from freezer storage (-20°C) to 150°F, both fabric and film sides tested
  • California Proposition 65 Compliant: Meets California's safe harbor levels for listed chemicals
  • EU REACH SVHC Compliant: Verified against the European Substances of Very High Concern list
  • EU RoHS 10 Compliant: Meets European restrictions on hazardous substances
  • UPF 50+: Blocks 98% of UV radiation
  • Made in USA: Manufactured by AKAS Tex
Chemical-Free Verifications
  • Forever Chemicals-Free: Manufactured without PFAS, PFOA, PFOS, or PTFE
  • Phthalate-Free: Verified free of DEHP, DBP, BBP, DINP, DIDP, and DnOP
  • BPA-Free: No bisphenol A in any fabric or finishing treatment
  • Organic Cotton: 80% organic cotton sourced through the US Cotton Trust Protocol — bio-based, vegan, latex-free
  • Nanoparticle-Free (W-522 Silver): Silver Plus antimicrobial uses silver ion compounds, not engineered nanoparticles

Fabric vs. Finished Product: CPSIA certification of the fabric component does not automatically certify your finished product. Depending on how your product is constructed, independent CPSIA testing of the finished item may also be required.

For what these certifications mean, see Understanding Wazoodle Fabric Certifications & Safety Standards. For how FDA food-contact certification works across the full FoodSAFE product line, see ProSoft FoodSAFE PUL: The Complete Guide to FDA Food-Contact Certified Waterproof Fabrics.

ProSoft Organic Cotton Interlock ECO-PUL Care: Washing, Drying, and What to Avoid

ProSoft Organic Cotton Interlock ECO-PUL maintains its Waterproof 300X Technology (300+ wash cycle durability) when care protocols protect the polyurethane film from chemical degradation and heat damage. The fabric arrives cut-and-sew ready — do not pre-wash before construction.

Washing

Wash in hot water (rated to 145–165°F) with a zero-residue liquid detergent — warm water extends film lifespan. Add an extra rinse cycle to remove detergent residues that accumulate on the polyurethane film.

Drying

Dry on medium heat only — never exceed 130°F (50°C). High heat causes polyurethane breakdown appearing as stiffening, cracking, or delamination.

What to Avoid

Substances that permanently destroy waterproofing: Fabric softeners coat the polyurethane film and eliminate both waterproofing and breathability — damage is irreversible. Chlorine bleach causes delamination. Vinegar and baking soda break down the laminate bond. Dryer sheets coat the film identically to liquid softeners. Non-chlorine oxygen bleach is acceptable sparingly for W-389 Standard only — avoid on W-522 Silver and W-681 FoodSAFE variants.

Manufacturing Odor

New fabric may have a noticeable smell from the thermal bonding process. This dissipates within 24–72 hours of airing or after a single wash-dry cycle.

ProSoft Organic Cotton Interlock ECO-PUL Specifications: Weight, Width, and Variant Comparison

ProSoft Organic Cotton Interlock ECO-PUL's three variants share nearly identical specifications. The key differences are weight (W-681 FoodSAFE is 255 GSM vs 245 GSM for Standard and Silver), Silver Plus antimicrobial treatment on W-522, and FDA food-contact certification on W-681.

Specification W-389 Standard W-522 Silver W-681 FoodSAFE
Weight 245 GSM (7.2 oz/sq yd) 245 GSM (7.2 oz/sq yd) 255 GSM (7.5 oz/sq yd)
Thickness 0.032" 0.032" 0.032"
Width 55–60" 55–60" 55–60"
Fiber Content 80% organic cotton / 20% PU 80% organic cotton / 20% PU 80% organic cotton / 20% PU
Hydrostatic Pressure 225 psi (~158,000 mm) 225 psi (~158,000 mm) 225 psi (~158,000 mm)
Breathability (MVTR) 850 g/m²/24h 850 g/m²/24h 850 g/m²/24h
Burst Strength 152 psi 152 psi 152 psi
Crosswise Stretch 10% 10% 10%
Shrinkage 1–2% (both directions) 1–2% (both directions) 1–2% (both directions)
Technologies ECO-Thermal Bonding + Waterproof 300X + SilentFlex ECO-Thermal Bonding + Waterproof 300X + SilentFlex + Silver Plus ECO-Thermal Bonding + Waterproof 300X + SilentFlex
Antimicrobial No Yes — bacterial, fungal, algae inhibition No
FDA Food-Contact No No Yes — 21 CFR 175.300, 177.1680
UPF Rating 50+ 50+ 50+
pH 7.4 (neutral) 7.4 (neutral) 7.4 (neutral)
CPSIA Certified Yes Yes Yes
Made in USA Yes Yes Yes

All specifications may vary ±10% due to textile industry manufacturing standards.

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