How does the waterproofness and durability of this pant compare to that of some of the gore-tex pro shell offerings? Would I be able to stand in a river and stay dry with these?

Tech Specs:

Material:

[membrane/laminate] Helly Tech Professional (3-layer, polyamide) 

Insulation:

none 

Fabric Waterproof Rating:

25,000 mm 

Fabric Breathability Rating:

22,070 g/mē 

Seams:

fully taped 

Venting:

3/4 side zips 

Pockets:

2 front hand, 1 thigh 

Gaiters:

yes, removable 

Weight:

830 g 

Recommended Use:

mountaineering, alpine climbing