ABIRAMYoga Socks Toeless Non-Slip Grips & Straps, for Pilates, Barre, Ballet, Bikram, Workout for Women

What size is UK 6?

I am looking for something to wear for yoga that I can insert my orthotic arch support in to. Would these be suitable?

can you please add a size chart? S M L = ??? what

Are the straps of these non slip please? I'm looking to use these for pole fitness and hoping to climb the pole in them.