great waterproof socks
My feet are warmer in these socks than my neoprene socks on cool floating days, which is exactly what i was looking for. They can let water in if you step into water that goes above the top of the sock, but not immediately. They are exactly what I was looking for!

Functional
These socks did the job. They are durable and dependable and served me well during a canyoneering trip. My only issue is how well they sealed (or didn't!) at the top. When they are completely submerged, water enters through the top cuff and then is sealed INSIDE the socks. Watch out for trench feet!

Still need to test in COLD water.
In preparation for my yearly fall camping, hiking, kayaking and fishing trip to Moosehead Lake and the Maine North woods I tested my new Seal Skinz Liner Sock w/Water Blocker in three bodies of water. A local lake, in the Atlantic ocean off Point Judith, RI and at Quabbin Reservoir in central Ma. During my activities I used the socks with Teva Sling King and Keen Hood River boots. With the Sling Kinks water found its way into the socks. When using the Keen boots inside the socks stayed pretty dry. In all occasions my feet and legs were submerged in water for long periods of time. The socks are easy on/off when wet and dry quickly. Will find out how warm the sock keep my feet and lower legs when in Maine. Soon I will be trying the socks with my zoomer swim fins as I lap swim at the local YMCA. I'm sure my feet will thank me! I am happy with my purchase.

they do exactly what i wanted them to do
i bought these to wear with my OTB boots. my feet stay dry no matter how long i have them underwater. i highly recommend these if you plan on doing anything near water during the winter months

Love them
After trying the NRS version of these while kayaking, I purchased the Seal Skinz. I love the Seal Skinz! Big difference in comfort as the NRS socks are not waterproof. Your feet feel clammy all day in the NRS socks. With the Seal Skinz, my feet feel dry and comfortable. I highly recommend these.