HYHP 20 Pieces Self-Adhesive Hat Size Reducer Hat Bands, Hat Sizing Tape Hat Size Reducing Tape for Women and Men (Black and White), Black & White, 3

This product actually worked well to resize a hat. And the left over pieces of adhesive foam (black and white ones) are useful for many things (as pads under vases or trivets, etc.). Rather expensive though, I thought.

Quick delivery, item was just as described

Easy to use, adheres securely so far. Hat fits much more comfortably. With all this rainy and breezy weather, I am very glad it won't blow off at the first tug of wind!

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Strips are easy to install. I used four strips on a straw hat that was too big on me, and now it fits great. I just put the strips on yesterday, and haven't worn the hat anywhere yet. The strips seem like they are going to stay on okay. I would recommend this product if you have a hat too large.