The swimming cap materials on the market are roughly divided into "silicone swimming cap", "nylon swimming cap", "PU swimming cap", "spandex swimming cap" and "fabric swimming cap". So how to choose a swimming cap?
Silicone swimming cap:
Silicone swimming caps are the most popular nowadays. The design of the swimming cap minimizes the resistance. It is impermeable, not easy to crack (on the premise of not being scratched by nails and sharp jewelry), sticky or aging deformation, and it is also comfortable to wear. At present, the swimming cap is also designed with inner particles, which has anti-slip effect.
Nylon swimming cap:
It is comfortable to wear, with small resistance, and can improve swimming speed; Good hygroscopicity and dyeability, with alkali resistance and reduction resistance; It has good resilience and can return to the original shape after repeated stretching.
PU swimming cap:
Very light: the density is only 1.25, slightly higher than water. It has the properties of fire prevention, waterproof, moth-proof, mildew-proof, crack-proof, etc. It is very suitable for indoor and outdoor decorative materials, and is a new green decorative material. Easy to process: PU products can be nailed, sawn, planed, milled, bended, and shaped, and are not cracked, deformed, and moth-eaten, and can be used indoors and outdoors. Environmental protection: the use of synthetic fiber as raw material reduces deforestation and can meet the standard of non-toxic and harmless green products. Waterproof property: no water absorption, seepage, deformation and mildew resistance.
Spandex swimming cap:
It is very breathable, so it is not waterproof. The texture is soft, and it will be more comfortable to wear. It is suitable for children to play in the water. Spandex has good acid and alkali resistance, solvent resistance, light resistance and wear resistance.
Fabric swimming cap:
Butler, loose and comfortable, but not waterproof, bad for hair.
It is recommended to use silicone swimming caps for beginners, swimmers and professional athletes. Protect your hair and respect your friends and opponents.
For silicone rubber, please check the details:
https://www.siliconerubbers.net/product-general-purpose-grade-htv-silicone-rubber.html 
