Designed and developed with 2x IronManR World Champion Tim DeBoom, the new isoTransition was built to perform when it counts on race day. The quick pull lacing system and self draining midsole are designed to help you shave valuable minutes for your next PR. The breathable, Seamless Upper provides such amazing out of the box barefoot comfort, you'll swear that someone is tickling your little piggies. Amen. 1:1 Seamless Upper creates an unparalleled fit with a seam free interior. 1:1 360 Lacing anatomically conforms to the foot for a tailored fit regardless of foot shape. Quick lacing system for easy entry and fast transition times.