I have 5.0s and they're seriously so comfortable. I thought running in them with such little padding would hurt but they don't at all. Because there's so little padding it helps you to not strike the ground as hard as you might if you had more cushion so it's better for your joints. I'll probably get 3.0s some day. And they're super light. Wearing them and then going back to regular sneakers you feel like you're wearing bricks with how have and stiff they are.