The main panels of Castelli's Evoluzione Bib Knickers are sewn from Castelli's 2stradi fabric. This midweight knit both pushes and pulls moisture to the surface for fast evaporation. Staying dry in cool weather is necessary to stay warm, and it's also necessary when the clouds unexpectedly part and your ride becomes muggy. The bib straps are mesh to keep moisture from building up against your skin. At the bottom, InMold silicone leg grippers keep the eight paneled shorts from riding up. To keep your backside comfortable, Castelli uses the Kiss3 insert. Though the name is a bit odd, it provides anatomically shaped panels of varying thicknesses that distribute pressure so that your perineal nerves are protected. It is designed to move with you using seamless, brushed microfiber. Additionally, the microfiber has a bacteriostatic treatment that helps to eliminate saddle sores.