Sea to Summit Silk Blend Sleeping Bag Liner

The Sea to Summit Silk Blend Sleeping Bag Liner is a 150 g mummy-shaped liner blending 72% Thermolite Pro infrared yarns with 28% silk, aiming for the soft hand-feel silk is known for while adding a bit more warmth than pure silk alone would give. At 150 g it's noticeably lighter than the synthetic Reactor and Breeze liners in the same range, making it a reasonable pick when packed weight matters more than the extra warmth boost those heavier options provide. It's also available in a rectangular cut with an integrated pillow sleeve for hikers who prefer more room to move or want the liner to double as pillow storage; the mummy version reviewed here trades that space for a closer, warmer fit.