I have a pair of 5 mil Quiksilver Cyphers and they keep my hands plenty warm. Cuffs are easier to use than the Drylocks and they are sealed well. Hands do get wet but in 40* water all 5 fingers stayed warm for about an hour and a half. My hands stay warmer than my split toe Drylock boots do, my big toe freezes in those things once the water is below 45*, f$%k im getting cold thinking about this crap, surfing in a 3/2 down in VB still so dont want to think about that crap yet.
For winter I've been wearing my 5 ml Excels for the past two seasons. No doubt the warmest part of my body. A little hard to get off though at the end of a session. this time of year the 3 mls have been fine. love having some grip when the air is cold. Last weekend was the last time for boardies.
I use hyperflex 5mm and although the will break quickly, even with the small holes in them they have been more than fine on the coldest days, cost like 20 bucks . They are pretty thick. I don't think 7mm is needed, 5mm are fine. for NJ winters.
This is gonna sound funny coming from me but Dont buy Hyperflex gloves I got 2 sets and they both leaked on the first session. I got Drylocks last year and I love them . They take some time getting use to the on and off but They seal nice