Hydroskin 1.5 Socks

These kept my feet noticeably warmer than the thinner wetsocks I've used, and I barely noticed the extra 1.5mm thickness once my booties were on. The seams sit flat so there's no rubbing after a couple hours in the water.

Wore these for a cold morning paddle and my feet stayed warm the whole two hours without feeling bulky in my booties. The 1.5 thickness is just right when the water dips below 60.

Paddled a cold river last weekend and my feet stayed comfortable the whole three hours in these. The 1.5mm thickness is a nice middle ground—warm without feeling like I'm wearing dive boots. Only gripe is they take a while to dry overnight.