Constructed with grid-fleece, these bibs trap heat next to your body without adding bulk. The fleece is also abrasion and odor-resistant. These Midlayer Bibs feature a convenient front zipper and stretch-woven stirrup cuffs to keep them in place under your waders or boots. With the Simms Fleece Midlayer Bibs, you can enjoy catching fish and watching the sunrise without shivering.