Silicone Skin Pouch For Nike/iPod and Nike Plus Nike/SportBand - Compatible with all Shoes - Black
Pretty sturdy, and they look nice and I never notice or feel it while running. I purchased a few. They are handy, takes a few seconds to put the sensor in or take it out, and that way I can switch it to a pair of sneakers that work best for the terrain I will be running on. Works much nicer than when I just taped the sensor to my laces, and looks better too.