SMARTWOOL® PHD HYFI TRAINING BEANIE :: Protect your smarts against the cold with a SmartWool® PhD HyFi Training Beanie. The contoured design drops down to protect ears for extra warmth and the three-panel design offers a snug yet comfy fit. Gear up without bulking up thanks to the tight knit construction. Great worn alone or under a helmet.
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Reviewed by 1 customer
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Comments about Smartwool PhD HyFi Training Beanie Headwear:
Got this to wear under my bike helmet and it does the trick. Not real tight (and I have a large head) so I'm not sure how it would last running, but under a helmet it works well.
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