The Elastic Goes on Permanent Vacation
The magic of a swimsuit lies in its stretch, a quality provided by elastane fibers (you probably know it as spandex or its brand name, Lycra). A good swimsuit typically contains 15-25% elastane, giving it the necessary cling and flexibility. In budget
swimwear, however, two things go wrong. First, manufacturers often use a lower percentage of elastane to cut costs, resulting in a less secure fit from the start. Second, and more importantly, they use a lower grade of it. Premium elastane, like Lycra Xtra Life, is specifically engineered to resist the trifecta of swimsuit destroyers: chlorine, sunscreen, and salt water. Cheaper, generic spandex is highly vulnerable to these elements. The fibers break down quickly, causing the elastic to lose its tension. That’s why the waistband on your bargain bikini bottoms feels loose after just a few swims—the elastic has effectively given up.
A Lining That's Barely There
Lining is the unsung hero of swimwear. It serves several critical functions: it provides opacity so the suit isn’t see-through when wet, offers an extra layer of support and structure, and protects your skin from friction. In high-quality suits, the lining is often made of a soft, substantial material that might even be the same fabric as the outer shell. This is where fast-fashion swimwear makes its most obvious compromise. To save money, manufacturers will use an incredibly thin, flimsy, or loosely woven lining material that does little to conceal or support. In some cases, a suit might only be lined in the front panel or the crotch, leaving the back to become transparent as soon as it hits the water. A poor lining is also more likely to bunch up, shift, or even retain water and sand, making the suit uncomfortable and ill-fitting. When you see a white swimsuit that’s shockingly transparent, the culprit is almost always a cheap, inadequate lining.
The Sad, Saggy Lack of Recovery
“Recovery” is a textile term for a fabric's ability to return to its original shape after being stretched. It’s the snap-back quality that keeps your swimsuit hugging your body instead of drooping. This is directly tied to the quality of the knit and the elastane fibers within it. Inexpensive swimwear is often made from fabrics with poor recovery. When you move, swim, and stretch, the fabric gives way, but it doesn't bounce back completely. This is what leads to the dreaded “saggy bottom” or the top that feels a size bigger by the end of the day. Heat, from the sun or a hot tub, accelerates this process. The fabric essentially “grows” with wear. High-quality swimwear fabric is constructed with a tighter knit and superior elastane that has excellent memory. It can stretch significantly and still snap back to its initial form, ensuring the suit fits just as well on its twentieth wear as it did on its first.
How to Spot a Better Suit
You don’t need to be a textile expert to avoid these pitfalls. When shopping, you can become a more informed consumer with a few simple checks. First, read the tag: look for an elastane/spandex content of at least 15%, and if it mentions a quality brand like Lycra, that’s a great sign. Second, use your hands. A well-made suit will feel substantial, not flimsy. Hold the fabric up to a light in the store; if you can see through it easily when it’s dry, it will be transparent when wet. Give the fabric a gentle stretch and see if it snaps back immediately—this is a good test of its recovery. Finally, check the lining. Is it present throughout the entire suit, or just in a small panel? A fully lined suit is a strong indicator of better construction and durability, suggesting it was built to last more than a single season.
