Emilio gave these shorts and bibs the "400-Mile" name from product testing consisting of 400 miles over 4 days. His logic was that many shorts feel fine for 100+ mile rides. The real question is how does that saddle feel when you get on the bike the next morning for another 100 miles...and the next morning? This was the inspiration for the design, the pad, and the name. * Inseam lengths: S-8" 20 cm, M-8.5" 21.5 cm, L-9" 23 cm, XL-9.5" 24 cm. * S Waist 24"-27", M Waist 27"-32", L Waist 32"-35", XL Waist 35"-41". * This 11-panel bike short has a CarreraTM Piqué Abdomen panel to hold in your midsection, and to give you bit more breathability in front, just above the pad. Drawstring elastic waist, CurvilinearTM seamlines, contrast flatstitch, and the 400-MileTM Pad make it the most comfortable short money can buy. It has 3 pockets (one on each leg, and one in back) that fit cell phones, mp3 players, fuel packets, and most sunglasses. One of the great features of this short is what it does not have...it does not have any elastic leg gripper, so there is no tight binding around the thighs. The short stays down and in place since it is made of Forza CompressorTM.