Cocoon CoolMax TravelSheet

Published · Researched 2026-09-21

SKU: UNVERIFIED as an official Cocoon manufacturer part number. Retailer MPN seen: CMT35 (Great Lakes Outpost listing, UPC 0000799696106072). Research date: 2026-09-20. All prices USD, observed through indexed retail sources on that date — re-verify live before purchase; indexed crawl ages vary.

1. One-line summary

The hostel-to-summit workhorse liner: a roomy 100% CoolMax EcoMade rectangular sleep sack at 10.8 oz that wicks sweat, dries fast, adds ~9°F of warmth, and doubles as a standalone summer bag — the liner most travelers actually own.

2. 2026 lineup note

Current as of 2026-09-20. Cocoon's liner family spans fabrics (CoolMax, silk, cotton, fleece, Thermolite) in two cuts: TravelSheet (rectangular, this product) and MummyLiner (tapered, drawstring hood, boxed foot). The CoolMax TravelSheet is the warm-weather/moisture-management pick. Sibling-track items (Sea to Summit Reactor Extreme liner, also new in this catalog) are covered separately — the two liners serve opposite seasons.

3. Lineage note (2023–2026 changes; buying old/clearance/used)

• The CoolMax TravelSheet is a long-running Cocoon staple (the brand has made liners since 1989).
• EcoMade update: current fabric is 100% CoolMax EcoMade (recycled-content) — the performance story (four-channel moisture-wicking fibers) is unchanged; the sustainability story is new. Exact year UNVERIFIED.
• 2025–2026: no verified redesign; US street ~$60.
• Buying old/clearance/used: older non-EcoMade CoolMax sheets are functionally identical — fine at a discount. Liners are intimate gear; buy used only if you can hot-wash it. Check the Velcro side closure and pillow-sleeve stitching.

4. Detailed specifications

5. Pricing in USD (observed 2026-09-20, not checkout-verified)

• US street: ~$60; availability was spotty in the sampled US listing — re-verify live.
• MAP status: UNVERIFIED for this product.

6. What's in the box (and what's needed)

• Included: ripstop nylon stuff sack.
• Nothing else needed. Machine or hand wash; tumble dry low.

7. Warranty

• "All COCOON gear is guaranteed against manufacturing or material defect" — wear and tear, misuse, and alterations excluded; discretionary paid repairs offered (per cocoonusa.com warranty text).
• UNVERIFIED: exact current claim process and proof-of-purchase requirements. Check cocoonusa.com before relying on this.

8. Support & parts

• UNVERIFIED: Cocoon's official repair program details and spare-parts availability as of Sept 2026. The liner's simplicity (no zippers, minimal hardware) makes field repair a non-issue.

9. Community verdict (aggregated, sourced, balanced)

• Why people buy it: it's the traveler's liner — roomy enough to actually sleep in (86×33" rectangular, not a mummy straitjacket), CoolMax's wicking keeps sweaty sleepers comfortable in hostels and tropical camps, and it dries absurdly fast on a line. The pillow pocket (stuff with clothes) is a small feature owners love. At 10.8 oz it's light enough to live in a travel pack permanently.
• Honest negatives:
  • The +4.7°C warmth claim is modest — this is not a bag-booster like the Reactor Extreme; it's a hygiene/comfort layer with a small thermal bonus.
  • The Velcro side closure is divisive — it can snag hair and base layers, and some users wish for a zipper.
  • Rectangular cut means extra fabric bunches inside a mummy bag — mummy-liner fans prefer Cocoon's own MummyLiner cut.
  • Polyester hand feel isn't for everyone — silk-liner devotees find CoolMax clammy in humid heat (ironic, given the wicking pitch).
  • US availability was "currently unavailable" at the sampled retailer — it's easier to find in EU/UK outdoor shops.
• Bottom line: the travel liner — bought by hostel hoppers, hut-to-hut trekkers, and summer campers who want a washable sleep surface, not a warmth layer. Pair it with the Reactor Extreme if you need both ends of the season.

10. Images

1. [research workspace] — details in [internal image manifest — not shipped]
2. [research workspace] — details in [internal image manifest — not shipped]
3. [research workspace] — details in [internal image manifest — not shipped]

• [research workspace] (700×700 JPEG) — person in navy CoolMax liner with stuff sack, in-use. Source: goodnjoy.com Cocoon listing (https://goodnjoy.com/product/search.html?banner_action&keyword=%EC%BD%94%EC%BF%A4)
• [research workspace] (400×536 JPEG) — composite: person in blue TravelSheet, retail packaging, and stuff sack. Source: fashionplus.co.kr Cocoon listing (https://www.fashionplus.co.kr/goods/brand-shop/28596/seller-shop/24440)
• [research workspace] (1000×1000 JPEG) — person in grey liner with stuff sack, in-use. Source: shopee.tw Cocoon listing (https://shopee.tw/product/10610151/25908580413)

11. Sources

• https://www.cocoonusa.com/products/coolmax-travelsheet (official specs: 10.8 oz, 86×33", EcoMade, warranty text)
• https://www.greatlakesoutpost.com/product/variations/2638102/cocoon-coolmax-travelsheet-bluemax ($59.95, MPN CMT35)
• https://www.hardloop.co.uk/product/37325-cocoon-coolmax-travelsheet-sleeping-bag-liner (+4.7°C claim, 305 g, 220 cm)
• https://www.absolute-snow.com/cocoon-coolmax-travelsheet-ultralight-sleeping-bag-liner (feature detail, care)

Long-term durability & warranty-claim reality

Polyester liners are nearly indestructible in normal use — the CoolMax knit resists tearing and the stitching (double-stitched, reinforced gussets) holds up to years of stuffing. The Velcro closure is the wear point: it collects lint and loses grip over time (clean it with a stiff brush). Wicking performance declines gradually with fabric-softener contamination — never use softener. No pattern of failures surfaced in this pass; the product's decades-long run is itself the durability evidence.

Head-to-head vs closest rivals

• vs Sea to Summit Reactor Extreme (catalog): opposite missions — Reactor is the winter booster (+25°F claimed, mummy, $85); CoolMax is the summer/hygiene layer (+~9°F, rectangular, $60). The two-liner system covers the full year.
• vs Cocoon Silk TravelSheet (same brand): silk packs smaller (150 g) and feels better against skin; CoolMax wicks better and costs less. Sweaty sleepers pick CoolMax; minimalists pick silk.
• vs cheap Amazon liners: the Cocoon's stitching, Velcro, and pillow pocket are the quality delta — budget liners shred at the seams within a season.

Care & maintenance

Machine or hand wash; tumble dry low. Wash colors separately. Never use fabric softener (kills wicking). The liner dries fast — line-dry when you can to extend Velcro life.

Buying traps

• TravelSheet vs MummyLiner: same fabrics, different cuts — the TravelSheet is rectangular (this product); the MummyLiner is tapered with a drawstring hood. Confirm the cut.
• Warmth expectations: +4.7°C is a hygiene layer's bonus, not a season-stretcher — don't buy it to winterize a summer bag.
• US availability: the sampled US listing showed "currently unavailable" — check EU/UK retailers or Cocoon direct if US stock is dry.

Sources

• goodnjoy.com — retrieval date not recorded
• www.fashionplus.co.kr — retrieval date not recorded
• shopee.tw — retrieval date not recorded
• www.cocoonusa.com — retrieval date not recorded
• www.greatlakesoutpost.com — retrieval date not recorded
• www.hardloop.co.uk — retrieval date not recorded
• www.absolute-snow.com — retrieval date not recorded