Castelli Nanoflex 2 BibknickerComprised of Castelli's iconic Nanoflex fabric, the Nanoflex 2 Bibknicker provides unmatched warmth and a terrific range of motion. Castelli uses minimal seams in the construction to keep comfort levels high. The KISS Air Donna seat pad keeps you comfortable in the saddle all day, and the bib straps are mesh to improve ventilation. There's hi-viz screen printing on each leg, so you're always seen.FeaturesNanoflex fabric is warm, water repellent, and comfortableKISS Air Donna seat pad offers lasting comfort in the saddleReflective elements on pant legs keep you seenCastelli Men (Unisex)SizeSmallMediumLargeX LargeXX LargeXXX LargeChest35 1/2-3737-38 1/239-4141-4343-4545-47Waist29 1/2-31 1/231-3333-35 1/235 1/2-37 1/238 1/2-40 1/241-43Hips36 1/2-38 1/238-4040-4242-4444-4646-48Inseam31 1/23232 1/432 3/43334 3/4Castelli Sizing InfoCastelli products are aggressively cut and are meant to fit optimally in the riding position. If you are in-between sizes, you may want to size up as the fit may be very form fitting. If you have questions, please contact our Gear Advisors.