You can push hard without losing grip or experiencing chatter

how you look and feel is sometimes almost as important as product performance

Made with a Dura Cap Sidewall construction that provides reliable edge grip when it really matters

as well as camber and rocker profiles

Extra padding at the ankle and calf

atomic redster tr f4 Testskidor Race You can push hard withoutThe Atomic Redster TR F4 is a boot built for powerful skiers who want maximum response without going up to the stiffest model. With a flex index of 130 and Atomic's thickest TR shell, you get a boot that is stable, compliant and can handle high pressure. Perfect for skiers who find 150 too much. The shell is made of Atomic's most stable and temperature resistant Formula Plastics, which provides consistent performance regardless of weather conditions.