Material lexicon

Fibreglass (GRP)
See: Thermoset plastics
Lightweight textile material with fleecy, combed surface, often made from polyester fibres. Gives outstanding thermal insulation, yet is very permeable to moisture.
Knitted fabric made of a mixture of polyamide and elastane fibres, with a waterproof laminated finish of TPU (polyurethane-based thermoplastic elastomers). The elastic, waterproof and breathable characteristics of the material make it ideal for close-fitting rainwear. Super-lightweight and extremely comfortable to wear.
Forehead vent
Supplies fresh, cool air to the head ? improves the helmet climate.