Made of 90% Nylon and 10% Spandex, I can't believe they feel as soft as if they were made of cotton. I ordered them XXL and they fit well even though I am medium US (32 waist). Very light and comfortable fit. The only setback is that unlike my "Hanes", they do not have an opening in the front. But I can work around that.
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https://www.amazon.com/CAIKENI-Underwear-Trunks-Comfort-Boxer/dp/B071RNLQX2