Athletic shoes should have a comfortable fit to minimize friction, which can lead to blisters and irritation. Depending on the sport, the height of the upper (low-cut, three-quarter-top, or high-top design), the laces, and construction of the sole may vary. Properly constructed athletic shoes have a sturdy construction, leather or canvas uppers, a flexible sole at the forefoot, adequate cushioning, and arch supports.
It is important to remember to regularly replace worn athletic footwear to avoid wear and tear on the feet due to worn soles, weakened heel counters, and evident creasing of the upper. Walking or running shoes should last for about 400 miles. Sneakers for basketball, tennis, and aerobic exercise should be replaced about every 50 hours of wear.