j.a.l"Precision fit" has a narrower toe box. "Standard fit" is a fairly roomy toe box (on the Inov-8s I have, anyway) that lets you splay your toes. Great for weightlifting and cross-training. Inov-8s are all I've bought for training and light hiking for 5-6 years now. Great shoes. Bummed that this drop doesn't include size 13!