Superfeet Carbon Insoles An innovative design brings you a combination of supremely strong carbon fibre with ultralight foam, the Superfeet Carbon Insoles deliver runners with mild to moderate support. The structured heel cup at the back of the sole stabilises the foot, protecting it from damage by naturally absorbing impacts below. For further stability, there is a carbon fibre stabiliser cap. This is a foam layer which is reinforced by Superfeet's developed Evolyte. The support that the feet receive ranges from mild to moderate. Made in a low profile shape, this further helps the stabilise and support the foot, working to reduce stress felt on the feet, ankles and knees. A bevelled edge makes improves the fit of the insole in tight footwear, without compromising its main functions. For wider footwear, the forefoot is also accommodated as the insole can be flexed wider. A lightweight and breathable design, the insole has foam perforations under the midfoot and forefoot, which work to reduce the weight and improve breathability. Sweat and bad smells is controlled, with a natural coating that works to remove odour-causing bacteria. For a long lasting and comfortable ride, there is lightweight highly durable foam. This closed cell foam delivers long-lasting comfort in tight-fitting athletic footwear, making mile 26 feel the same as the very first one. Made to last, the insole keeps its shape, delivering high-quality performance for up to 12 months or 500 miles. Size Guide Size B / UK 2-3.5 / EU 34-36 Size C / UK 4-5.5 / EU 37-38.5 Size D / UK 6-7.5 / EU 39-41 Size E / UK 8-9.5 / EU 42-44 Size F / UK 10-11.5 / EU 45-46.5