Pretty sure Airblaster invented these. Actually true. Maybe. The first outerwear pants that Airblaster ever developed in around 2004 had elastic bottoms. Airblaster brought samples to the trade show. People said, "Ha-ha... Seriously, though. ... They're going to have normal bottoms, right?" And they were like, "Duh. Yes. Like, that elastic is just a joke, obviously." and then changed them. But it wasn't a joke. 

Fabric: Stretch Canvas With Durable Hammercloth Contrast Knee Panels

Fit: Relaxed Fit

Waterproofing: 15K Waterproofing/10K Breathability

Seams: 2 Layer Fully Seam Taped Glacier Construction

Insulation: Shell With Lightweight Tricot Fleece Lining

Gaiters?: Yes, Elastic Gripper Cuff At Bottom Openings
 
Features: Eco-DWR Built-In Weaved Nylon Waist Belt 2 Zippered Front Pocket Zippered Back Pocket