Sportsheets Sex In The Shower Collection Neoprene Collar with Suction Cup. Think of the things you could do while your lover is held secure in the shower with this fully adjustable neoprene restraint collar. The attached suction cup keeps them firmly in place while you indulge in some good clean fun. Includes: 1 neoprene collar with suction cup and Velcro closure. One size fits most. Materials: Neoprene, polypropylene.