The Prime was designed with a lower cuff height and softer tongue for ease of entry and greater mobility. Being a member of the Feather Frame family, the Prime offers greater performance than any other entry-level boot. The Feather Frame is the first boot system to completely integrate the mounting system, base plate, and comfort outer shell all into a single component. No screws or plates are attached to the newest, lightest boot system in the industry. The Feather Frame is amazingly light without sacrificing the structural integrity of the chassis. Prime boot also features a redesigned footbed with a defined heel cup and arch and double lacing system for a dialed fit. Sizes: S(5-8), STD(7-11), XL(10-14).