Reactor Lightweight Sleeping Bag Liner with Thermolite Pro

Every gram counts on an ultralight trip, and the Reactor Lightweight earns its place in the pack. Thermolite Pro fabric uses hollow-core fibers and infrared-absorbing ceramic pigments to trap body heat, adding up to 4°C|7°F of warmth without much bulk.

Stretch-knit construction and shaped arm openings let you roll over and reach out without fighting the fabric. A fitted hood keeps your head warm, and the stretch means the liner fits any sleeping bag shape you own.

HeiQ Fresh odor control keeps it fresher between washes, and it dries quickly. Snap connectors at the shoulders pair it with Sea to Summit sleeping bags. Machine washable, too — which means less washing for your bag.

Features

• Lightweight and insulative, Thermolite® Pro technology with hollow-core fibers and infrared-absorbing pigments enhances warmth with minimal pack size
• Freedom to Move – Stretch-knit and shaped arm openings allow unrestricted movement, providing natural comfort throughout your sleep
• Technical Shape and Hood – Ergonomic design with a fitted hood delivers optimal warmth and comfort without extra weight or bulk
• Fits any sleeping bag - Stretch fabric means the Reactor Liner fits any shape of sleeping bag
• Stay Fresh Longer – HeiQ Fresh odor control technology keeps the liner fresh after extended use
• Sleep System Integration – Snap connectors at the shoulders easily pair with Sea to Summit sleeping bags for quick, hassle-free entry and exit
• Easy to Keep Clean – Machine washable construction simplifies care and reduces wear on your sleeping bag over time
• Lower Impact Materials – Crafted with certified recycled fibers and bluesign APPROVED materials to minimize environmental impact