Because they are slip-ons, I dont use them at the playground on any play equipment or when riding his bike. My internal doors are "standard" hollow core wood doors. The SRH1540 go from a deep, soulful bass to appropriate airy treble without making much of a fuzz about it. Im a 16 and the XL fits nicely without clinging to my chunky hips. We were not doing anything rough or high impact while wearing them. Also, Id like to see the charger base be made with a bit more high quality material. So I picked this up. Now i feel like im sucked in . Looked all over for mustard colored sandal and these are the best. Bowling? Yeah, there is ONE maker of EEE, and it looks like you are wearing Grandpas shoes.