How does UPF work?
A fabric’s UPF rating depends on a few key factors, colour, fibre type, density, construction, and any treatments used. Dark colours absorb more UV rays (which helps block them), while lighter colours reflect light back onto the skin.
Tighter weaves give better protection, and synthetic fabrics like nylon and polyester tend to outperform natural fibres like cotton or hemp. All of Sun Ray's UPF50+ products have been tested and certified to a minimum protection of at least UPF50. The actual test result is usually much higher than UPF50.
You won’t find clothing rated below UPF 15, since anything lower isn’t considered UV protective. And remember—UPF ratings only apply to the areas the garment actually covers!