I couldn't rate these trousers highly enough for tropical conditions - especially for those places with little malarial/dengue fever/japanese b-carrying blighters. Smart enough to get by when needed, they are so light they feel as I imagine Harry Potter's cloak of invisibility to feel - so no sticking to your knees and thighs or generally feeling uncomfortable in the searing heat of the evening. I've not yet had a mosquito penetrate these - they will soon be tested to their limit in mangrove areas of the Philippines and I am confident they will pull though - but I'll let you know. For now, suffice to say these make the choice between shorts and lathering on layers horrendous DEET vs trousers in the heat a no-brainer.