This stretchy sleeve slips comfortably over your or your partner's penis/strap-on, fully covering the tip and most of the shaft. Once in place, it can help stop a too-fast finish in its tracks (if a penis is in play) since your or their most sensitive spots will tuck away inside. Meanwhile, that extra layer adds more filling thickness to a chosen penetrator while the texture adds sensation. 
In slick, flexible, phthalate-free TPE (elastomer), the Ribbed Sleeve is extra easy to maintain and keep clean. Before and after use, wash it well with plenty of warm soapy water, or grab a good toy care fluid/foam/mist. Add some must-have slipperiness with a favourite water-based lube.
*The Sleeve is about 6"/15.2cm long. The interior stretches from 1.4"/3.6cm up top, 1.5"/3.8cm toward the middle and 1.6"/4cm at the base.