Sea to Summit Fusion PrimaLoft Sleep Liner w/ Free S&H — 2 models

The Fusion PrimaLoft Sleep Liner delivers the highest warmth-to-weight performance in the range, designed for sleepers who want maximum thermal efficiency with minimal bulk. Using PrimaLoft Active Evolve, a high-loft, breathable fabric inspired by animal fur, it traps warmth while regulating temperature and moisture overnight. Soft, stretchy and comfortable next to skin, the Fusion liner moves naturally as you sleep and packs down exceptionally small, extending sleep system warmth without upgrading to a heavier bag.

Specifications for Sea to Summit Fusion PrimaLoft Sleep Liner:

Features of Sea to Summit Fusion PrimaLoft Sleep Liner:

• Highest Warmth-to-Weight Performance: Delivers exceptional warmth for its weight, maximising thermal efficiency without unnecessary bulk
• Breathable Thermoregulation: Traps warmth when you need it, then vents quickly to release excess heat and moisture when you don't
• Packs Exceptionally Small: Advanced loft structure compresses down to a remarkably compact size for minimal pack volume
• Comfortable Next-to-Skin Feel: Soft, fabric-like construction is designed to be slept in directly, without the clammy feel of traditional insulation
• Stretch Fabric That Moves With You: Flexible construction adapts to movement and sleeping position, maintaining comfort throughout the night
• Lightweight Sleep System Upgrade: Adds meaningful warmth to your setup without the weight penalty of a heavier sleeping bag

Package Contents:

• Sea to Summit Fusion PrimaLoft Sleep Liner