Cap Sweat Liner — Single-Layer Hat Insert

I've been wearing it for my daily fieldwork and even on weekends for about a week, and it's been awesome for keeping the sweat from soaking through my new hat. The only drawback is that it can fall out when I take my hat off to fix my ponytail, etc., and I have to keep track of it. I can totally adjust to this, but it is a minor drawback. I've ordered a couple more to give as gifts and to keep in my weekend hats vs my work hats. I'm glad there are two colors so I can keep them separate.

Awesome product