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The basics
Kahl's Hat Stiffener is specially formulated to protect the shape of material through heavy wear.
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The benefits
It will not turn yellow or flake off like most hat stiffeners do.
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The uses
This product's gentle stiffening action allows you to dial in your preferred level of material retention.
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The bottom line
Kahls Hat Stiffener will not affect future hat cleanings, shapings or reblockings.