The Fat Boy Sport is perfect for guys looking for a more snug fit. The stretchy extender adds a noticeable girth to your penis and makes it feel really huge. It's super easy to get on and off and stays in place by hooking onto your balls with the opening on the bottom, which also gives the most pleasing tug on your balls. The Fat Boy Sport also makes a great stroker with its nubs and ribs and soft cushioned feeling on the inside. It is made of Silaskin, which is a mix of Silicone and TPR which gives it an unbelievable stretch factor. It is not compatible with latex products. The inner diameter is 5.5 in. which is designed for a snug fit and a perfect size extender for penetration. Comes with free bottle of adult toy cleaner.