Check the listing for details. EVS R4 Adult Race Collar. Condition: New with tags. Listed at 149.99 USD. EVS R4 Adult Race Collar Great selection Fly products 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 PU coreHi-tensile closed cell PU core absorbs impact energyBio-foam liner provides extra impact absorptionRapid lock closure system for easy front entryAdjustable rear strut for a customized fitWeight ADULT = 635 grams, YOUTH = 386 grams California Customers: WARNING: This product may contain chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov