My husband has been wearing the My Package underware. I came across these as I was pursuing Amazon for some other options. He is 6 170 lbs and the medium fit great. We manage a ranch and are outdoors in all types of weather. He just spent 8 hours on s tractor in 90 degree temps and was very comfortable. Love that the fabric is bamboo!!! Impressed with the company. Will purchase again and will look into their other offerings.