These things work like magic. I have always had a problem with excessive sweat dripping down into my face during games, so when I heard in the locker room these were a thing, I was immediately intrigued. I hopped on Amazon and ordered a 6 pack for around the $20 mark. I tried it and I love it. You never even have a drop of sweat come down your face or shield, leaving your field of vision perfectly clear and no gross face sweat.
The only problem is they are only good for one use, so unless you play like once a month which no hockey player does, its a complete waste because they are expensive. Overall, if you struggle with sweat, I highly recommend trying these out.