Primos

Primos is an industry leader in game calls, hunting blinds, scent masking and many other hunting accessories. From the primos.com website:

"The Primos® Double Bull Dark Horse™ Ground Blind is the Cadillac of ground blinds. It has plenty of room for multiple people to sit comfortably. The Dark Horse™ weighs less than 20 lbs, which makes transportation to and from the field easy. The silent slide window adjustment system and the shoot through netting make this a great blind for the bow or gun hunter. The Dark Horse™ comes available in Ground Swat™ Camo.
The Dark Horse™ has a black interior to eliminate "profiling" and maximize concealment. The Dark Horse™ features Primos Double Bull's Silent Slide window system which spans a full 180° across the front of the blind and adjusts from 1" to 20" vertically. You can "open"

the window or cover it with shoot-through netting. Adjustable framework, which is why we pre-stretch our fabric, and incorporate a rotating/locking hub in our blind frame. If the fabric seems loose, simply rotate the hub which lengthens the strut and tightens the faric, eliminating wind flap!"

Here are the current eBay listings for Primos: