The Slim D, one of Doc Johnson's® most popular shapes, has a width that is pleasurable and comfortable for most bodies and is available in both FIRMSKYN™ and dual density ULTRASKYN™. Dual density ULTRASKYN™ warms to the touch and is designed with a soft exterior and firm core to emulate the feel of a real penis, while the FIRMSKYN™ option offers a firmer feel in a classic pleasure product material.