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.
16 Gnu Swallow Tail Carver . 16 NS West . 15 NS Snowtrooper BIA
16 Burton Genesis X . 15 Now Drive
16 Flow Talon . 14 Flow Hylite