Inspired by a true scientific fact about some shrews who significantly reduce their brain mass to conserve energy in the winter! This is a six panel, unstructured, low-profile baseball cap aka dad hat in pigment-dyed, vintage-look washed red or periwinkle blue.

Fully adjustable using a metal sliding buckle at the back. Unisex fit, adjustable from hat sizes 6 5/8 to 7 3/8. Designed by Permascowl. Perfect headwear for anyone self-deprecating, shrew and rodent lovers (people often mistake this guy for a rat - that works too), or biology nerds! This is a great fact to whip out at parties.