At first, when researching "BIFL" standards of bed sheets, the common synopsis for "BIFL" bedsheets was to look for linen, supposedly more durable than traditional cotton and, most importantly, more breathable. After days of research, CULTIVER came up numerous times for their OOTB softness and quality. I'll admit I was originally hesitant to purchase these since they are ~400$; however, after a week of usage, so far, I'll admit the sheets met my expectations. They're soft, breathable as I am a hot sleeper, and feel tough and durable. My only complaint when I first bought these is after 2 washes (first before using, second after the first week), I noticed a few loose threads after removing the sheets. Overall, I have high hopes for the sheets and expect them to last me at least a year at minimum.