they don't stretch much.
I'm a perfect 9 in all things Held. I also have the Powerlet liners. They're too tight for me in my size 9 warm n dry(awesome gloves btw-love mine). I'm on the lookout for a pair of warm n dry in 10's. I think that is what will be needed to use the liners. They're pretty bulky.
2015 KTM 690 Enduro R, 2008 Yamaha WR250R, 1971 Lambretta DL