At 18:46 09 March 2015, Tim Taylor wrote:
Best is solar gray followed by blue and green. Do not put clear on a
glider, too hot and no UV protection.

A good clear canopy already cuts out about 95% of UV transmission
according to Mecaplex. A tinted one may cut a bit more UV but they
are intended to reduce heating from direct IR transmission - by how
much I do not know - but that is why they are blue or blue/green.

John Galloway