Datex is a material with dual layer that consists of a layer support of polyester/spandex with a top layer of 100% natural latex.
It has the appearance of rubber, but can be sewn and is not as vulnerable as the rubber. Another advantage is that it can be easily placed, without the help of talcum powder or silicones. Once that glides much more easily over the skin, and is a good material to make a hood.
The Hoods of datex from Mister B are nice and sit perfectly, are of a premium quality and give you a sense confined wonderful; your head is comfortably encased in this material plain black, without being so heavy and extreme as rubber or leather which usually masks/hood feature.