How do you measure which size you need? T
From the web site:
Sleeve Length: 1"
-Measure when flaccid
Size #1: Fits a 3" to 3 3/4" - 7.5cm to 9.5cm Penile circumference
Size #2: Fits a 3 3/4" to 4 1/2" - 9.5cm to 11.5cm Penile circumference
Size #3: Fits a 4 1/2" to 5 1/4" - 11.5cm to 13.5 cm Penile circumference
I have both #2 and #3. While #3 is a much better "fit" for me, I use #2 the most. I have to slather on a great deal of water based lube to get it on. When on, the snug fit seems to act almost as another ring.
No matter which size, I found soaking the tube in hot water before putting it on makes application much easier.