"R" on the box labels refers to regular sizes which are equivalent to "M" Medium sizes.
1200-denier Cordura nylon side panels
Hidden side pocket
Anti-bacterial Drilex lining
Prone Position Grip
Triple stitching
Engineered to excel in a broad range of operational environments, the A.T.A.C. Storm Boot delivers superior comfort, protection, and tactical utility in a clean, professional profile.