He's certainly got some girth to him, I'll say that. Very smooth so with lube it quite literally glides, but stretching definitely needed to get anywhere with this one :( Like, we're talking warm up toys, multiple fingers... a bit more than multiple fingers... and still could not fit the knot in. Would probably be okay with a bit more patience and a bit more lube, but I'm currently out of both. The toy itself is great quality though, very easy to clean and the suction cup is excellent.