Compatible with tons of dildos, vibes and probe-type toys, the Harness Brief's built-in O-ring stretches from 1.5" (2.5cm) in diameter. Any toy with a wide or flanged base and a diameter of 1.5 to about 2 inches (2.5- 5cm) wide should fit just fine. You'll be able to simply slip the base straight into the O-ring from the front of the Brief, or thread it in through a covered opening behind the crotch. 

Just pull these ultra soft and comfortably snug Briefs up over your hips like underwear, add a favorite dildo or otherwise, and you're good to go. No straps. Machine wash...air dry

Small-Waistband stretches from 28" (71cm). 

Large-Waistband stretches from 32" (81.3cm).