Enjoyable way to spend an hour! The second I slipped them on they were pure comfort and fit perfectly. It has a power adapter box attached to the plug that I stick behind the unit. I will say this. Jog on the treadmill in these daily for 40-75 minutes and I?m getting another pair now for when these wear out. Contacted the manufacturer and they sent me 4 brand new ones and I received them in just a few days. BUY THE 3-PACK ASSORTED like I did. It worked so well that I tried them on my work truck. Update (9/2/20) Not only did these slippers warp, but they also noticeabley shrank. Hatte Anfang 2020 einen günstigen Multicolor 4er Pack geordert.