Our Medium Large Swim Cap is the little sister to our Extra Large caps. Unstretched, the opening measures 21cm and the height measures 25.5cm.
If you don't have the length to fill up the height of the cap it will fall fairly flat against the back of your head.
Just like any swim cap, if you completely submerge your head a little water may seep in under the edges but for the most part, your hair will remain dry and any wetness that may occur will dry quickly. The cap can be stretched to fit over the head but take care not to tear the silicone by over stretching or with sharp nails or jeweller