So, I wear a 12and a half shoe. This sucks because nobody makes 12 and a half. Merrel shoes a 12 is too small 13 too big, nike 12 too small 13 too big, new balance I can fit in a twelve in some shoes and cant in others. These run about a one eighth of an inch longer than a pair of size 12 new balances that I can fit into (the ones made in america, I took out the insoles and measured) so if you dont know what size to get hopefully this helps. They fit me perfect. Have not tried them on the trail yet.