This is an attachment for all standard snapback-style hats (also known as baseball hats). This hat strap is used for hats that fit too tight or too big. The way it works is it allows you to use half sizes from the traditional or as an extender.
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White Snapback Hat
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Snapback hat half size attachment/extender
CIYODO 30 Sets Cap Supplies Hat Extender Adjustable Hat Bands Adjustable Hat Straps Snapback Extender Hat Accessory Portable Cap Extenders Cap Accessory Bottle Cap Plastic Single Row : Sports & Outdoors
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Snapback Extension
Hat Extender
Snapback