Boost trousers ok?

[Monsieur]

I'm after some trousers, need to be fairly cool on hot days and MUST be waterproof when needed.
I've got the Hein Gericke Cruise jacket which is a brilliant bit of kit but I'm loathe to spend too much on trousers. I've looked at their Boost trousers and at £59.99 seems a good buy.
Any advice?
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[Jazbee]

I've also got the Cruise jacket and agree its superb mid winter or high summer. Did not like the trousers though and bought HG Tricky GTX which are excellent but a little heavy for high summer use. A cheap recommendation would be the Akito desert pants, fine for spring-autumn use, mine have all liners removed and they make great summer trousers. Look good, cargo pockets, vents etc and only about £59 The knee pads are not the comfiest though, I changed them with some old knox ones which were kicking about the garage.