The men's Burton Midweight Base Layer Crew is made with DRYRIDE Ultrawick Midweight fabric that's scientifically engineered to pull heat-robbing sweat away from your skin and propel it through your outer layers. You stay dry, warm, and stoked all day, and since it's midweight, you get versatile warmth that works all season. This shirt comes stocked with added features including Four-way stretch for mobility, Agion® Stink-Proofing, and chafe-free seams for a friction-free ride.