The Berghaus Blade lightweight, breathable 2.5 Layer Aquafoil® Light overtrousers with 3/4 inch zips look nice (only 230g and £60).
I had an alternative idea to full zips:
use baggy no-zip trousers with (rear)straps above knee and at ankle, in light rain wear over front of leg (secured at waist, above knee and ankle), so well ventilated (similar to rainlegs as used by cyclists). In heavy rain, step into trousers and use straps as compression straps to stop flapping. (could use mcyclist plastic bag over boot trick)
Alternatively, why not huge internal storm flap and leave out the full length zip, just use several (five/six) patchs of velcro at waist top of thigh,above below knee at ankles.
Also, in full zip trousers, why bother with the draw string, the two velcro strips could be used for adjustment.
Would making the trouser waist band out of 2in mesh not be more comfortable and ventilated?
Edited: 29/12/2006 at 15:24