Having never had any experience with catheters, I suggested my husband try a condom catheter because I thought it would lessen the risk of infection and other issues. He tried a couple of different kinds of condom catheters and easily the GeeWhiz brand was the best. The 29mm was a bit too small, but the 32mm was perfect and it has worked very well when it is applied correctly. I am really happy they offer the unknown size starter pack. Thank you GeeWhiz!