Dougwrote a review of Helly Hansen Neck Warmer on January 22, 2019
Familiarity: I've used it several times
These are comfortable and do a great job keeping your neck warm. Either in cooler weather to provide some protection, or in really cold weather in conjunction with a hood. It fills up the gaps between your neck and the hood/neck covering and helps keep your warmth.
Only downside, the color of mine is very faded/pale. More like a light blue and teal. It works, but isn't a color I would normally choose.