UltimateS Mid Rise Bikini - Black video thumbnail
UltimateS Mid Rise Bikini - Black video thumbnail
Wear it with

UltimateS Mid Rise Bikini Black

Price $18

Our sizing reflects the true bell curve of the average person in the United States. For US, a medium is an 18-20.

Still unsure of your size? Email a fit expert.
Size Guide
41 people have this in their bag.
UltimateS underwear are final sale for quality assurance purposes. If you have any questions, please refer to our size guide or reach out to US.

anti microbial
fabric recovery
sustainably sourced

We made the unsung wardrobe heroes you've been missing. The best basics—underwear, perfected. These classic mid-rise bikini undies boast just the right amount of coverage and a cheeky cut. With a tonal elastic band and soft trim, they’re made from sustainable cotton jersey blended with modal for a smooth, light-as-air feel and second-skin fit (like they’re barely there). You shouldn't have to think about underwear—leave that to US. We've thoughtfully engineered each pair to feel so comfortable you'll forget you've got anything on at all.

Why UltimateS?

  • The elastic waistband has a comfortable width and sits flat without cutting in.
  • The classic rise is comfortable and secure.
  • They’re lightweight, breathable, antimicrobial, and moisture-wicking.
  • The generous gusset width is graded per size.
  • The soft and stretchy trim allows for flexible leg openings that sit flush without digging.


Body: 47% Lenzing Modal
47% Cotton
6% Elastane
Liner: 100% Cotton


Machine wash warm with like colors, only non-chlorine bleach, tumble dry low, cool iron.


Our Size Philosophy

Our sizing reflects the true bell curve of the average person in the United States. For US, a medium is an 18-20.