These Waterproof mitts should be ordered in larger size if your measurements are borderline. Sierra at OLS advised me to jump up to Large and that was a great call. Have yet to dive the mitts but the quality and fit are excellent. For our 40+ F water they will work.
Only fly in the ointment was the terrible USPS handling of the shipment. 21 days and had to place a tracer. Otherwise a "5".
OLS, Bill and Sierra, are first tier and really jumped in when order went "missing". Recommend them and the shop.