Description
- Comfort: Soft, flexible 4 way super stretch XSPAN neoprene make this sock easy to put on and take off Perfect worn alone or under a dive boot or water shoe for extra warmth Flat seams help prevent rashes, will keep your feet comfortable for long periods
- Warmth: Available in 2 thicknesses: 1.5mm and 5mm Use 1.5mm for warm water and 5mm for cold water
- Grip: The bottom of the sock is coated with a thermal applied poly coating, help provide long life to a high wear sole area Excellent grip for walking on the deck, dock or shore
- Durable: extremely durable and stretchy sock for all watersport and outdoor activities, for use in, on, around or under the water
- Use: for use with snorkel or dive fins, water skis, wake boards, SUP’s, use under water sport boots and shoes, surfing, kayaking, Mud sports, obstacle racing and outdoor hiking

If you are deciding between the 1.5 mm and 2 mm thickness because you need warmth but are afraid the 2mm will be too tight, go with the 2mm. The difference is negligible at least with the Keen sandals I tried them in. The qualify seems good with good stitching. I expect these will last for a while. My only complaint is the seam on the inner sole seems to rub and irritate just a bit. I turned them inside out which helped slightly. I took a star off for this.
Update 10/20/14
I used these for the first time for their intended purpose and I was happy with them. I bought these to river hike near the North Shore of Lake Superior in the fall since the water is freezing by then. Daytime temps were in the mid 40s and the water was stinging cold. These socks under Keen Sandals postponed the stinging by about 10 seconds with the feet submerged. However, they allow your feet to heat back up after getting out of the water which you can't do with bare skin in cold air. For this reason alone they were well worth the money spent on them. I wish I would have went with the 2mm though. These will not work for keeping the feet warm under water for long. It became painful after about 20 seconds. I also added another start from 4 to 5 since the seam irritation is unnoticeable after you start hiking with them on. You don't even pay attention anymore. As an added bonus these keep the rocks out of your Keen sandals.
I bought these to replace the booties on my Simms waders. They're just too damn small for my big feet.
These are well made and I'm happy with my purchase. Time to get gluing!
-will leave future review after given a few water trials.
UPDATE: Did some bridge jumping today(30ft) and finally got to try out my new NeoSport 5mm Socks. Boy did they deliver! I was much warmer with these rather than bare foot I mean worlds of difference. The entire time both in and out of water I felt as if my feet were in a warm bath, this is so pleasant during fall season when outside temps are in the 40 farenheight and water very cold as well. This product is a steal at the price and I would buy again hundred times over.