From the IST, that has been around since 1976, comes the IST HD10 Beanie. Made from 3mm thick neoprene material, this beanie is suitable for dives in temperate waters. It is highly comfortable to wear, and stretchy to fit most head sizes.
A good hood to have to protect the heads, especially the bald ones, from sunburns during any water sport activities. It also displays great warmth retention ability.
One thing to note is that it has two vents located at the top of the beanie. Effective in preventing unwanted pressure or bubbling, and allow air or water to escape the hood easily.