Sea to Summit Reactor Fleece Sleeping Bag Liner Size:Standard Mummy Our boxer briefs are a

Our boxer briefs are a 50/50 supreme cotton/polyester blend that lasts twice as long as 100% cotton

Crafted with a blend of Merino wool and Lyocell

Underarm pit zips allow quick heat release during climbs and high-output efforts

a zip fly and belt loops

it works as a midlayer or standalone piece when temperatures drop and output stays high

Sea to Summit Reactor Fleece Sleeping Bag Liner Size:Standard Mummy Our boxer briefs are aThe Sea to Summit Reactor Fleece Sleeping Bag Liner is constructed using advanced hollow core Thermolite Pro fibers in a grid pattern design, making it the warmest liner option available for cold weather conditions. With added features such as shoulder zippers and a drawcord footbox, this liner gives you the ability to regulate your body temperature throughout the night. Its compatibility with the Free Flow Zip system of Sea to Summit sleeping bags