The small end that grips the penis is fluted and splits easily rendering it unusable. I'm average size. The solution would be for the sleeves to be offered in sizes [S,M,L] or that it be made of tougher silicone. Sacrifice a little comfort for usability- it hurts a little when you pump your penis to full extension anyway.
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Disappointing Product, September 25, 2011
Disappointing product. Purchased the "clear" and "smoke" universal silicone sleeves. Even with proper preparation (lube etc) and proper fitting, to a 2 inch diameter pump (note, sleeves can be accomadated on up to a 3 inch diameter pump); both sleeves ruptured on the first attempt.