The Fire Specific Yoke, featuring Mystery Ranch's patented Futura system, telescopically adjusts to any torso length and promotes ventilation. Fire Yoke - Specifically designed 5,08 cm. narrower than the standard Futura Yoke to maximize ventilation without compromising load carriage comfort. Mystery Ranch’s yoke houses a frame sheet/adjuster whose aircraft-grade 7075 Aluminum stay is pre-curved to match the contour of the upper back.