After several hundred miles in the Luna Oso, I felt like a slight mod would improve performance, and it did- dramatically. As they came from the factory I could never get the strapping to feel just perfect, and had trouble with the heel straps never staying up as high as I wanted. The provided addon tech straps helped, but i dont care for them and they didnt alleviate my fit problems. Basically the slits where the straps go through the bottom of the sandal were too far back towards the heel, and I felt that the entire sandal would be more secure if these slits aligned more under the center of the arch at the sides of the foot. So I moved these cuts about 1.25 inch forward of the slits provided by the factory and then ran the straps through the new slits. A small caping knife was the perfect tool for the job, and a the flat screwdriver on the swiss army knife to push straps through the holes. The whole process took maybe twenty minutes. Doing this changes the angle of the ankle stap and allows it too ride properly over the heel bone and the straps feel natural without having to overtighten anything. Hope this helps anyone having problems with their Lunas, they are a great sandal, with great grip, and not much to break. =)
