Our Sunscreen shade solution comes complete with headrail cassette by default. Choice of openness factor of 1%, 3% and 5% (indicating the % of fabric area with perforations) Shades block between 95% to 99% of UV rays depending on openness factor chosen. There a choice of weave pattern and colour and also a collection of sunscreen fabric with a metallic backing for enhance UV and heat protection due to the extra reflective quality.