I'll lead up to 5.6 in these. They climb quite well. They fit like a glove. Only 2 issues I have found: 1 - Due to the grey foam cushioning coming so far up the foot(for hiking comfort) they tend to roll on small edges when using inside big toe or outside pinky toe a bit. 2 - I'm the only person I know that has had this problem buuuut... after a day of guiding in the rain, both soles delaminated up to where it meets the gray foam. A bit of shoe goo fixed it right up! I'm a guide and I generally love these shoes. Many guides in my area use them as well. The rubber lasts a long time after the 5.10 Tennie has worn out.