A stretch back panel. You get the picture. The women's Burton Reserve 2L Stretch Bib Pants have plenty of flex, so you can tuck, turn, and twist to your heart's content. Riders designed 'em, so you can be sure they've got what you need to keep you dry and ventilated out on the hill. Fit & Design: Regular fit bibs Back pockets with hook-and-loop closure Zippered chest pockets Zippered handwarmer pockets with microfleece lining Mesh-lined no-snag thigh vents Stretch back panel Tuned for riding including zippered thigh vents and a mix of secure pocket for hauling the goods Technology: DRYRIDE two-layer stretch shell is waterproof, breathable, and quick to dry while offering the stretch for easy movement YKK(R) Zippers bluesign(R) approved materials Additional Details: Imported