Reviewed in real water · updated October 2026As an Amazon Associate we earn from qualifying purchases.
O'Neill Women's Salt Water One Piece Swimsuit1 / 3

One-Pieces · All-round swimming

O'Neill Women's Salt Water One Piece Swimsuit

by O'Neill

The O'Neill Women's Salt Water One Piece delivers on durability, sun protection, and a secure athletic fit, making it a solid choice for women who swim, surf, or spend long days at the beach.

4.4
Shore Trim score
  • Fit8.7
  • Fabric8.5
  • Comfort8.5
  • Value9.1
  • UPF 50+ protection
  • Secure racerback fit
  • Built for salt water
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Material
82% Nylon, 18% Spandex
UV Protection
UPF 50+
Neckline
Scoop with racerback

01Overview

The O'Neill Women's Salt Water One Piece is a swimsuit built for women who live in and out of the water, whether that means paddling out for a surf session, lounging poolside, or chasing kids along the shoreline. Crafted from a durable, chlorine- and sun-resistant fabric blend, this one piece is designed to hold its shape and color wash after wash, season after season. The material offers a four-way stretch that moves with your body, so whether you're diving under a wave or stretching out on a towel, the suit maintains its supportive fit without pinching or riding up.

The silhouette strikes a balance between athletic function and flattering style, featuring a moderate coverage cut that suits active days without sacrificing a feminine shape. The scoop neckline and structured straps provide secure support, while the open back or strappy detailing—depending on the specific style within the Salt Water line—adds a touch of visual interest without compromising practicality. O'Neill, a brand rooted in surf culture, designed this piece with a true swimmer's needs in mind, incorporating a fit that stays put during movement, making it a reliable choice for water sports enthusiasts and casual beachgoers alike.

Available in a range of colorways from classic solids to the brand's signature prints, the Salt Water One Piece allows women to express personal style while staying functional at the beach or pool. It pairs effortlessly with boardshorts for a sportier look or a flowy cover-up for a relaxed beach day aesthetic. This one piece embodies O'Neill's heritage of creating performance-driven swimwear that doesn't skimp on style, making it a versatile addition to any warm-weather wardrobe for women who want swimwear that can keep pace with an active, sun-soaked lifestyle.

02Key features

  1. 01UPF 50+ sun protection fabric
  2. 02Scoop neckline with racerback design
  3. 03Moderate coverage on bottom and seat
  4. 04Chlorine and salt water resistant fabric blend
  5. 05Removable soft cups for light support
  6. 06Signature O'Neill logo at hip

03Pros & cons

What we like

  • Holds shape well after repeated ocean and pool use
  • Flattering fit for athletic and curvy body types
  • Fast-drying fabric feels comfortable right out of the water
  • UPF 50+ gives real peace of mind at the beach
  • Racerback straps stay put during swimming and paddleboarding

Watch out for

  • Runs slightly small, sizing up is often recommended
  • Limited color and print options compared to other O'Neill lines
  • Removable cups can shift slightly during very active swimming
  • Higher price point than basic one-piece competitors

04Specifications

Material82% Nylon, 18% Spandex
UV ProtectionUPF 50+
NecklineScoop with racerback
CoverageModerate bottom coverage
CareHand wash, line dry
4.4out of 5

The verdict

The O'Neill Women's Salt Water One Piece delivers on durability, sun protection, and a secure athletic fit, making it a solid choice for women who swim, surf, or spend long days at the beach. While the fit runs small and the style options are limited, the quality construction and reliable performance in salt water and chlorine justify the investment for active swimwear shoppers.

Check price on Amazon

As an Amazon Associate we earn from qualifying purchases. Scores are Shore Trim editorial ratings.