US 6 - EU 37 - UK 4 - 230mmUS 6.5 - EU 37.5 - UK 4.5 - 235mmUS 7 - EU 38 - UK 5 - 240mmUS 7.5 - EU 38.5 - UK 5.5 - 245mmUS 8 - EU 39 - UK 6 - 250mmUS 8.5 - EU 39..5 - UK 6.5 - 255mmUS 9 - EU 40.5 - UK 7 - 260mmUS 9.5 - EU 41 - UK 7.5 - 265mm MaterialsVamp: 100% Recycled PolyesterQuarter: 100% Recycled PolyesterQuarter: 100% Thermoplastic PolyurethaneTongue: 100% Recycled PolyesterCollar Lining: 100% Recycled Polyester Key featuresThe supportive, feel-good running shoeHelion™ superfoam midsole for big energy returnUpgraded outsole that won't trap stones as you runCloudTec® cushioning to absorb impactPlush tongue for total comfort and easy step-inDurable heel clip and upper reinforcements for added supportTongue loop to keep laces in place (Super) superfoamFor professional athletes and new runners alike, our Helion™ superfoam is a game-changer. The upgraded midsole provides softer cushioning and higher energy return. Plus CloudTec® cushioning to absorb impact. So you can keep racking up the miles with confidence. 360° comfortFrom toe to heel, each element of the Cloudrunner 2 is designed to support your foot during movement. A plush tongue means total comfort and easy step-in, while a durable heel clip helps to lock in extra stability and support. (And say goodbye to trapped stones, thanks to an updated outsole.) Feel good shoesFor the Cloudrunner 2, the tech upgrades don’t stop at comfort and performance. This next-gen style features a mesh upper made with recycled polyester.