How to choose a swimsuits

Updated June 2026Independently researchedNo paid placement.

What fabric should you look for in a swimsuit?

The fabric blend determines both comfort and longevity. Most swimsuits use a mix of nylon or polyester with spandex (often called Lycra or elastane). A higher spandex percentage (typically 15–20%) gives better stretch and shape retention, but it can degrade faster under chlorine or sun exposure. Polyester blends are more chlorine-resistant and hold their color longer, making them a smart choice for frequent swimmers. Many trusted brands also use PBT polyester, a synthetic that resists pilling and fading. Check the label: if you swim mainly in pools, a polyester-based suit will outlast a nylon one by months. For occasional beach use, nylon-spandex suits feel softer and more comfortable against the skin. Avoid suits with cheap acetate or cotton linings, as they absorb water and stretch out quickly.

How do you find the right fit for your body shape?

Swimsuit sizing is notoriously inconsistent, so ignore the tag number and focus on coverage and feel. A one-piece should stay in place when you raise your arms overhead without excessive pulling at the shoulders or gaping at the chest. For bikinis, the band of the top should be snug enough to stay horizontal across your back, if it rides up, go down a band size. The bottom should cover your rear fully without digging in or sliding. Many buyers with a longer torso find that standard one-pieces ride up or create pressure at the crotch; look for brands that offer a “tall” length option. If you have a large bust, styles with underwire, wider straps, or a built-in shelf bra provide better support. For smaller busts, triangle tops or bandeaus with removable padding offer a customizable fit. Always read recent customer reviews on sizing before you buy, and consider ordering two sizes and returning one.

One-piece vs. bikini: which is right for you?

The choice depends on your planned activities and personal comfort. One-pieces offer more torso coverage, stay put during active swimming or diving, and often provide better tummy control or bust support. Many women also prefer them for lap swimming because there’s less risk of the top shifting. Modern one-pieces come in cut-out, high-leg, and wrap styles that rival the sexiness of a bikini. Bikinis give you the flexibility to mix and match sizes for different body halves, which is a huge advantage if your top and bottom sizes differ. They also dry faster and are easier to manage when using the bathroom. However, they can shift during vigorous activities and offer less protection from the sun. Think about where you’ll wear the suit most: lounging by the pool favors a bikini; open-water swimming or beach volleyball favors a secure one-piece.

What construction details affect comfort and durability?

Double-stitched seams and reinforced stress points (like where straps attach to the cups) significantly extend a swimsuit’s life. Look for flat-lock seams or zig-zag stitches that lay flat against the skin to prevent chafing. A good lining is essential: a built-in panty liner in one-pieces or bikini bottoms prevents see-through when wet and adds a layer of durability. Side boning or internal elastic along the torso helps one-pieces stay in place without rolling up. For bikini tops, a soft yet sturdy underband (often 1–2 inches wide) provides lift without digging. Avoid suits with glued-on foam cups; they often warp after a few wears. Instead, choose sewn-in cups or removable padded cups in a mesh pocket, which dry faster and resist sagging.

How should you care for a swimsuit to make it last?

Chlorine, salt, sunscreen, and heat are the main enemies of swimsuit fabric. Rinse your suit in cool, fresh water immediately after each use to remove chemicals and sand. Never wring it out, gently squeeze or roll it in a towel to absorb excess water, then lay flat to dry out of direct sunlight. Machine washing and drying are almost always too harsh; the agitator and heat can break down spandex and fade colors. If you swim frequently, rotate between two or three suits so each has time to recover its elasticity. Hand-wash occasionally with a mild soap designed for delicate fabrics (baby shampoo works fine). Even with the best care, expect a swimsuit worn weekly in a pool to last about one season; a suit worn only on vacation may last two to three years. Storing it damp in a sealed bag will accelerate mildew and fabric breakdown.

What are the best swimsuit features for different activities?

For serious lap swimming, choose a water-resistant, form-fitting one-piece with a full back (racerback or cross-back straps do not slip). Fabrics labeled “endurance” or “chlorine-resistant” are worth the extra cost. For surfing or paddleboarding, look for high-neck or long-sleeve rashguard suits with a secure zip closure and UV protection (UPF 50+). Many surf brands use thick, double-stitched seams that hold up to repetitive motion. If you plan to lounge by the pool or go on a cruise, style and coverage are more important. Look for adjustable straps, removable cups, and reversible prints to get two looks from one suit. Travelers often appreciate wrinkle-resistant fabrics and quick-dry linings. For plus-size or post-surgery wear, brands with tummy-control panels, wider straps, and built-in bra cups offer extra confidence and comfort.

Frequently asked questions