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Washing Care


How to Hand Wash Underwear and Swimwear

Washing Care

iSwim underwear and swimwear washing care: hand wash with cold water, do not bleach, do not dry clean, do not tumble dry, do not iron, do not spin dry at high speed, and dry naturally in the shade

Underwear Cleaning

  • Fabric colors are dyed, including white, so underwear should be washed before wearing.
  • Color fastness may vary depending on fabric and color. Some colors may release slight dye into the water during the first few washes.
  • Please wash dark and light-colored underwear separately. Do not mix wet underwear or swimwear together, as this may cause color transfer.
  • When underwear is worn in swimming pools, seawater, hot springs, saunas, or heavy-sweat conditions, chlorine, salt, hot spring minerals, sunscreen, tanning oil, and sweat may accelerate color fading and fiber damage. Please rinse thoroughly with clean water as soon as possible after wearing, and avoid storing it while damp or sealed for an extended period.

Beach Sand Removal

Sand can easily get into swimwear when playing at the beach. Here is how to clean it more effectively.

  • If there is sand on your body after playing at the beach, do not rinse the swimwear directly while wearing it, as this may push more sand into the woven fibers.
  • Before taking off the swimwear, gently stretch the fabric and pat or flick off the sand as an initial cleaning step.
  • If sand is trapped badly, we recommend cleaning it again after returning home. When the swimwear is half dry, turn it inside out and gently flick the sand outward.
  • In clean water, gently open the fabric or lining to reduce trapped sand, rub lightly, then soak in clean water for about 10 minutes before drying. If sand remains, repeat the process.
  • Most swimwear fabrics are elastic, and sand can easily become trapped between woven fibers. When both the swimwear and sand are wet, the sand still has strong adhesion, so it is usually easier to remove when the fabric is half dry.
  • Sand in swimwear is unavoidable, and it may not be possible to remove it completely. Swimwear with lining is usually harder to clean after sand gets inside. For beach use, unlined swimwear can be easier to maintain, and wearing a smaller thong underneath can also be a practical option.

Swimwear Care

  • Before swimming in a pool or playing in the sea, rinse your swimwear with clean water first. This can help reduce chlorine or saltwater absorption into the fibers. After swimming, please rinse the swimwear thoroughly with plenty of clean water, as pool chlorine and sea salt can damage the fabric.
  • Do not use a washing machine, spin dryer, or similar equipment to clean swimwear. In most cases, rinse with clean water first, then soak in clean water for about 20 minutes. You may repeat this 1 to 2 times to help dilute the chlorine remaining in the fabric. To check whether chlorine has been reduced, smell whether the bleach-like odor has become weaker.
  • If the swimwear is dirty or stained with sunscreen or tanning lotion, soak it in clean water with a small amount of neutral soap or mild dishwashing detergent, rub gently, then rinse thoroughly with plenty of clean water. Do not use bleach, hot water, or special laundry detergents.
  • Severe fading is not always caused by normal washing. Residual chlorine, seawater, sunscreen, tanning oil, or heavy sweat may remain in the fabric after wearing. If the garment is then left damp in a hot enclosed space, such as a sealed bag, car, or scooter compartment, these residues can accelerate fading and fabric damage. After wearing, rinse thoroughly with clean water as soon as possible and allow the garment to dry naturally before storage.
  • Place the swimwear inside a large towel and gently squeeze out the water. You may also use a swimming absorbent towel. Then lay it flat or hang it simply on a hanger in a well-ventilated area to dry in the shade. Do not use a dryer, expose it directly to sunlight, or dry it with high heat such as an iron. These incorrect methods may make the fabric dry, hard, and fragile.
  • After washing, please dry naturally in the shade. Do not store swimwear in a sealed bag while it is still damp, as long-term moisture may cause the fibers to harden. Swimwear can be stored with regular clothing, but please avoid storing it inside a silicone swim cap.
  • Please avoid mixing wet dark swimwear with light-colored clothing, as this may cause color transfer.
  • In summer sunlight, wet swimwear left for a long time inside the trunk of a car or motorcycle can become like being placed in a steamer. This can easily cause looseness, fading, or color transfer.
  • If the climate in your area is hot, avoid storing silicone swim caps together with swimwear and goggles for a long time, as prolonged heat and humidity may cause them to stick together and become damaged.
  • Remember: bleach, washing machines, spin dryers, tumble dryers, and similar methods can all damage the elastic fibers of swimwear.

Chlorine Dilution

  • If chlorine remains inside the swimwear fabric after swimming, it may continue to damage the fabric, color, and elasticity even after the swimwear looks dry. Chlorine has a bleaching effect and can easily damage swimwear fabric, especially softer and more comfortable nylon fabrics.
  • Rinsing swimwear with ordinary water or soapy water alone may not completely remove chlorine from the fibers. Chlorine is an important chemical for pool sanitation, but it is not friendly to swimwear. To keep the suit in better condition and extend its life, it is necessary to dilute the residual chlorine.
  • Therefore, after using a chlorinated pool, we recommend soaking the swimwear in clean water to dilute residual chlorine. Soak for 15 to 20 minutes and repeat at least twice.