There are perforations under the midfoot and forefoot. This helps reduce weight and improve breathability of your insoles, which is especially important if you tend to sweat a lot.

The Superfeet Carbons fit in a wide range of tight-fitting sports shoes, like cleats and running shoes. They're lightweight and breathable, and provide support, balance and comfort.

The heel caps and arch support are shallower than any other Superfeet insole, but the basic construction is the same. This allows the Carbon insoles to fit in a wider variety of shoes, and can even fit some dress shoes (if they have removable insoles). The Carbon insoles stabilize and support your feet by keeping your heel in position, and letting the heel caps absorb part of the shock as you're running. This reduces stress on your feet, ankles and knees, so you'll be more comfortable instantly (if you get the right size).

Superfeet insoles can not be machine-washed. You need to hand-wash them with soap and water, and allow them to air-dry. If you do so, they will last for up to 12 months or 500 miles, whichever comes first. Some users have reported that they still have the same pair after 2 years and approx. 2000 miles, so it's likely they'll last a long time.

The perforations improve ventilation, and the closed-cell foam has antimicrobial treatment, which discourages bacterial growth and helps reduce odor. The closed-cell foam also means that there are no pores in which bacteria could grow.