The Simms Thermal 1/4 Zip Midlayer Top adds warmth on its own or can be layered under your favorite jacket. The grid-fleece interior traps heat next to your body without limiting your range of motion or adding bulk. The smooth exterior makes for easy layering. Abrasion and odor-resistant fabricZippered chest pocketGrid-fleece interiorHigh collar with 1/4 zipper, allows for ventingFabric Tech: Body - 255gsm 93% polyester, 7% elastane finished with antimicrobial + moisture management