Enjoy a pumping experience with extreme comfort and protection and add the Advanced Silicone Pump Sleeve to your favorite pump. This flexible, stretchy, and protective sleeve does away with uncomfortable suction for a totally luxurious experience. Penis pumps work by using suction to create an airtight seal around your penis. Pumping leads to increased pressure and blood flow in your penis; in the short-term, this results in erections that are harder than ever. In the long-term, pumping encourages growth in both length