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They are set to become your “holy grail” undergarments.

Lourdes Avila Uribe is a senior staff writer at HuffPost covering shopping trends, lifestyle and new products.

The Chantelle underwear is available in a few different silhouettes, like hipster, bikini and high-cut briefs. One unique thing about this brand is that all the undies are one size fits all, designed to perfectly conform to bodies that traditionally wear sizes 4-16. My mother, who usually wears a size medium, was initially very skeptical about the lack of clear sizing, but was shocked to find that the fit is perfect.

The lightweight construction makes them ideal for anyone who easily overheats, is going through menopause, has sensory issues or just loves a pair of undetectable undies. They’re machine washable, though the brand recommends laying them flat to dry. You can get them in a range of hues, from skin-like nudes to lovely pastels.

“I am easily irritated by tags, leg openings that constrict, or fabric that rides up... And these panties are the perfect solution for all of these issues. I actually forget I’m wearing underwear. I was skeptical of a one size fits all approach, but they’re perfect. I’m going to stock up for sure!” —an9ymous

“I went in asking for full coverage panties that wouldn’t ride up and wouldn’t have visible panty lines (if such a thing exists!). A sales lady recommended these and I was skeptical but decided to try them. They are amazing!!! They really do all of those things and they are one size, so no worrying about getting it wrong. I am excited to replace older panties with these! By the way, I’ve worn them under jeans, under skirts and under leggings (running and otherwise) and they have been excellent in every situation!” —Raenak

“These underwear are definitely seamless! I am not a thong wearer so I am always looking for a good bikini or hipster that is seamless the really lives up to the name. I typically order a size small so was skeptical about the one size fits all. But the sizing was totally fine.” —Amyann

“I am absolutely obsessed with these! I only wear seamless undergarments, but I didn’t realize how terrible the other brands I was wearing were until I bought these. I had just become so accustomed to readjusting my underwear all day that I didn’t realize I was doing it. After I wore these and they stayed in place, I literally tossed all my other brands.” —slpscientist

“I bought these panties for the first time and really like them. I’m 74 years old and they fit well, very comfortable and they don’t show lines when wearing pants. I highly recommend these panties.” —Jewelbox

“Never thought I’d say this about a pair of underwear, but these are my holy grail pair. Obviously the perk here is function over look, but they’re not granny panties, just very basic looking. They’re super comfortable, and (unlike many invisible panty line underwear pairs that I’ve tried) don’t roll up at all on the edges. I’ve purchased multiple colors and washed them a bunch and continue to be impressed by the quality. For sizing reference, I’m a solid M/29/8 and these fit just fine.” —Juliagrace

“These are quite possibly the most comfortable undies ever! I love that they’re one size! They were/are amazing during my pregnancy and postpartum because I was so many different sizes! Now they’re my go to and I will continue to get them moving forward.” —Tulip28