TheThigh Strap On allows your partner to grind on your thigh, freeing up hands to do other things. Soft, comfortable neoprene forms to your body making this comfortable to wear as long as you need. Reinforced opening accommodates flared base dildos. Interchangeable rubber O Ring 1.5" (3.8cm). Largest circumference of the thigh Strap On is 22" and smallest circumference is 13.5". Machine washable. Dildo not included.