We decided sadly to return them four ones that had something across the back of the heel. The foam has also lost most of its cushion, especially under the heel. Appear to very durable. I ordered the Razer Lancehead TE Ambidextrous Gaming Mouse because it was one of the only white mice available that offered the chroma lighting and came from a reputable manufacturer. Not too heavy. The band is snug enough that the phones wont fall off your head even while doing cartwheels, but is not too tight that it will pinch or you will notice it at all. Dont overlook those teeny holes! Super comfy casual, received a ton of compliments. I dont know what material it is, but it feels very comfortable. These are literally my first pair of mules & they are sooo cute.