The male external catheter is worn just like a condom and is comfortable and easy to use. It is latex free, and made of silicone so there is no chance of latex irritation. When worn properly the male external catheter will not leak or come off, making it perfect for long distance racing applications.</br></br> Since every man is different, the male external catheters come in 3 different sizes. In this particular case, size is important. Cut out the half circles on the packaging card sizing guide to determine your size and eliminate the guesswork. Just in case you don't know your size, the Combo Pack includes all 3 sizes.</br></br> As an added feature, each regular Positive Flow Catheter Kit includes (2) self-sealing catheters. The combo kit includes one of each size. Remember, with Positive Flow, you get positive results!</br></br> Positive Flow Features:</br></br> Latex Free</br> Medical Grade</br> Hypoallergenic</br> 3 Sizes</br> Optional Combo Pack Includes (1) of Each Size</br></br> Kit Includes:</br></br> (2) Self Sealing Catheters*</br> (1) Hose</br> (1) Hose Fitting</br> (1) Product Card</br></br> * 2 catheters included with all regular kits, 1 of each size included in the combo kit