They are extremely comfortable for long-term wearing, and arent overly warm. The assembled rack is listed at 137 lbs; however, I was not able to measure this myself. Ordered a size 6. Once I swapped the insoles out, though, theyre great. Out of the box, they look great, seem durable, and would be comfortable if not for the restrictive instep. Slippers with manmade soles are too loud when you?re an upstairs neighbor. These are very comfortable and do provide arch support. I bought a used Festool tracksaw without realizing how expensive the tracks were. We did a book-bag outreach at our ministry and included these in the kids backpacks, since so many of them needed ear buds this year - they loved them. The light comes with no charge and I had to charge it before trying.