The Velcro strap kept poping open when you walk. Pero ya ahorita se sienten muy cómodas. There is zero latency no lip sync issues which is a huge plus. (I have a lot of knee-high boots, which fit perfectly once I removed one of the shelves. Buy the new refreshed 2020 model. You remove the buds from the case and turn on Bluetooth on your phone and they simply pair without a problem. I bought these for my son who is very picky about his footwear and he loves them! They are worth 2 or 3 times the price! The new ones could not be easier to install they just snap in place basically. The wide fitting and ample toe-box is also worthy of mention, as it affords the room for the feet to expand and wriggle room for the toes during prolonged exercise, as well as working well with the toe-cages on my ElliptiGO.