5W fit perfectly/comfortably right out of the box! It worked once, but now the ear bud is back to not working. They pay great attention to details including style. When you press and release, theres no short memory as you would have with memory foam. These shoes were designed for narrow feet. Convenient hook for hanging bag on the fence. There are two holes already and Ive only used it internally with moderate use. I highly recommend anyone looking for great cross ties that your horses cant break. So thankfully it was nothing wrong with the speaker. But they have absolutely no shock absorption or support, so they will not be comfortable for walking any distance.