Have you tried on POW gloves before? I've noticed they seem to run a little small so I've had to bump up a size on my POW gloves/mittens over what I'd usually get with a Dakine/Burton/Drop glove.
18 Snoplanks Asym Fish . 18 Arbor Terrapin . 17 NS Maverix . 17 NS Twenty Five . 16 NS Swift - 14 TJ Brand Retro Fish
18 Rome Katana . 17 Burton Malavita Wing . 16 Burton Genesis X
16 Flow Talon