The design uses breathable mesh material, and with ASICS's signature cushioning, the shoes are incredibly comfortable! Regarding the size, I usually wear a 24cm, but I think this product runs a bit small. Therefore, I went half a size up to 24.5cm to accommodate socks, and it was a perfect fit (*^^*) Please use this as a reference only... I've worn these once, so please understand that they are used. - Brand: ASICS - Color: Black - Style: Sneakers - Material: Mesh Thank you for looking.