I purchased two sets of these for my husband's birthday. He has been using them in as underwear since he was single and have been using size medium to large. I noticed he has been more coffeeI purchased two sets of these for my husband's birthday. He has been using them in as underwear since he was single and have been using size medium to large. I noticed he has been more comfortable in large so I went with that. However when the package arrived and we took out one brief it was so humongous much bigger than his current large size underwear. Normally exchange sizes of undergarments are not allowed but after lengths ofcomfortable in large so I went with that. However when the package arrived and we took out one brief it was so humongous much bigger than his current large size underwear. Normally exchange sizes of undergarments are not allowed but after lengths of requests of consideration, the store specialist allowed us to exchange for the right size provided that the items were untouched and in their original packaging. We would still continually use Marks and Spencer undergarments because of this favorable resolution. If you're unsure of your size I recommend you to go in storethe store specialist allowed us to exchange for the right size provided that the items were untouched and in their original packaging. We would still continually use Marks and Spencer undergarments because of this favorable resolution. If you're unsure of your size I recommend you to go in store to prevent inconveniences such as this from happening and save you from the hassle!