Equations That Changed the World Eco Martingale Collar Size:Medium Take your style to the

Take your style to the next level

earthy aroma of humus and pine

This mug features some of your favorite grassland animals

or pick some up yourself to document your loftiest of ideas

Equations That Changed the World Eco Martingale Collar Size:Medium Take your style to theThis math inspired collar is great for accessorizing your favorite fuzzy friend while you work on your problem sets. Martingale collars are what you need if your dog's head is smaller than its neck like a greyhound or a whippet, any dog prone to slipping their collar, or dogs with delicate tracheas and necks like chihuahuas and pomeranians. Our Martingale collars are available in three sizes, adjustable, and built with rPET webbing (made from recycled