Rubber sole Please refer to the Sizing Chart for Recommended Size Padded Collar and Heel for Comfort Padded Collar and Heel for Comfort A great all around comfortable shoe that is precise enough for your next gym session. Features double stitch construction, padded collar and heel, polypropylene midsole and one-piece binding. Size up for a comfort fit and size down for a more aggressive performance fit but keep in mind that climbing shoes are supposed to fit very tight and at a minimum your toes should be touching the end of the shoe. Your toes will be curled a bit if you buy a size down for a more performance fit. The shoes come pre downsized! We recommend for new climbers to go up a FULL size from their street shoe size.