Also known as "Wrinkle Free", seamless silicone swim caps are very similar to regular silicone caps however they are more rounded on the outside. The lack of seams on the exterior makes it more round, allowing for fewer wrinkles when worn. It’s the near wrinkle free construction that allows for swimmers to be more streamlined in the water. This type of cap has become the most popular for swim teams due to its being more streamlined.