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The R4 is a lightweight, form-fitting race collar offering protection against neck and collarbone injuries. The low profile design makes it a comfortable yet protective piece of gear you can wear on the track or on the trail. Hard molded upper surface disperses energy to the PU core. Hi-tensile, closed-cell PU core absorbs impact energy. Bio-foam liner provides extra impact absorption. Rapid lock closure system for easy front entry. Adjustable rear strut for a customized fit.