When you need warm weather breathability plus field protection from wet brush and abrasion, these are your best choice.  These are the lightest weight brush pants made by Filson.

Fit:	Allow for moderate shrinkage; shrinkage is most notable in the waistband and length. Relaxed fit: roomy thighs and seat, a longer rise and tapered legs.
Care:	Turn inside out, machine wash cold, line dry, allow for moderate shrinkage. Shrinkage is most notable in the waistband and length.
Materials Pants: Facing:	Dry Finish Cover Cloth, 6 oz. 100% cotton, 2 ply by 2 ply, treated with durable water repellent and stain resistant finish. Oil Finish Cover Cloth, 6 oz. 100% Cotton, 2 ply by 2 ply, paraffin treated for maximum water repellency
Weight:	approximately 1 lb 9 oz