A buckle configured to hold a wrapped weightlifting belt and provide fine adjustments to the snugness or tightness of the weightlifting belt is disclosed. The buckle may include an adjustable element, which allows the buckle to pull-in or ease the two ends of the weightlifting belt. The adjustable element may be a worm screw that can be rotated by a user to move a car of the buckle relative to the body of the buckle. The car may have legs that hold onto one end of the weightlifting belt via holes in the weightlifting belt, while the other end of the weightlifting belt is fixed to a fastener plate of the buckle. The buckle may include a wedge and lever design to latch the buckle closed. Additionally, the buckle's rugged design allows for the manufacture thereof with polymeric materials using low-cost manufacturing techniques, like injections molding.

Clothing belt adjustment systems are configured for wearing around a user's body such as around the waist. The belt adjustment system includes a belt and a buckle wherein the belt can be looped and secured to the buckle to secure the belt around a user's waist or other portion of the body. The buckle has a body with a thin side profile that is not overly bulky such that it can comfortably fit over the button region of a wearer's pants. The buckle advantageously includes one or more threaded retainer members, such as threaded screws, that secure one portion of the buckle to another portion of the buckle.

A back support device for supporting a lower back of a user may include an elastic strap, a first clasping element attached to a first end of the elastic strap, a second clasping element slidably disposed over the elastic strap and configured to releasably engage the first clasping element to form a continuous loop, and a buckle element secured to a second end of the elastic strap. The buckle element is slidably disposed on a medial portion of the elastic strap for adjusting a perimeter length of the continuous loop. The continuous loop is movable between a first position in which the continuous loop has a first perimeter length and a second position in which the continuous loop has a second perimeter length via elastic elongation. The first perimeter length is less than the second perimeter length.

A coupling system includes a bridge and a sleeve. The bridge has a first end and a second end, and in some embodiments includes a contoured edge at the second end and/or a row of openings disposed between the first end and the second end. The sleeve defines an internal pocket configured to receive the first end of the bridge through a sleeve opening. A closure mechanism on the sleeve is configured to selectively retain the bridge within the internal pocket. In some embodiments, the closure mechanism fastens behind the contoured edge at the second end of the bridge to resist withdrawal of the bridge from the sleeve. In other embodiments, the closure mechanism includes mating portions configured to fasten together within a selected opening of the bridge to inhibit relative sliding movement between the sleeve and the bridge. The coupling system may be integrated into or coupled to a belt system, a cummerbund, a chest rig, or other load-bearing system.

A coupling system includes a bridge and a sleeve. The bridge has a first end and a second end, and in some embodiments includes a contoured edge at the second end and/or a row of openings disposed between the first end and the second end. The sleeve defines an internal pocket configured to receive the first end of the bridge through a sleeve opening. A closure mechanism on the sleeve is configured to selectively retain the bridge within the internal pocket. In some embodiments, the closure mechanism fastens behind the contoured edge at the second end of the bridge to resist withdrawal of the bridge from the sleeve. In other embodiments, the closure mechanism includes mating portions configured to fasten together within a selected opening of the bridge to inhibit relative sliding movement between the sleeve and the bridge. The coupling system may be integrated into or coupled to a belt system, a cummerbund, a chest rig, or other load-bearing system.