The SX For You Beginners Harness is comprised of 2 strong silicone support rings, there's no need to measure dildos ever again as it is compatible with all dildos - even extreme dildos! Durable constructed strap-on harness is for first timers and advanced players alike. The performance pad is constructed from velvety smooth faux leather and the adjustable straps are soft nylon for comfortable wear. SX For You Beginner's Harness fits up to a 47 inch waistline.