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I was somewhat skeptical that a one-size-fits-all underwear was even possible, but it is. I typically wear a Large but these stretchy skivvies were more than accommodating. They have a good amount of give and they are not at all restrictive. I did find that they occasionally creep up, but not excessively so. They are lightweight and breathable and all-in-all a very comfortable undergarment.
My wife informs me that these fit well, although the leg portions were a touch tight although not uncomfortable. She did inform me that they are described as a "one size fits all" so she expects that somewhere something may not fit right. She says they comfortable, and don't ride during a full days wear. I think they look nice, and feel like they will wear for some time.
This is advertised as one size that fits small through extra large. I would say that based on the size I normally wear that this is more like extra small through large. I wear a large, normally and this pair cut into my thighs a little bit. The material was very nice and soft and was pretty stretchy. I liked it, overall.