The phrase "adjustable belt" is correct and usable in written English.
It can be used to describe a belt that can be modified in size to fit different waist measurements.
Example: "I prefer wearing an adjustable belt because it allows me to find the perfect fit for my waist."
Alternatives: "flexible belt" or "size-adjustable belt".
The external battery pack that powers the AbioCor can be worn as an adjustable belt around the waist or held up by suspenders.
The length of the sensor is 50 mm, the width is 30 mm, and the height is 25 mm (without the adjustable screw); two grooves at two sides of the sensor can attach an adjustable belt to help wear it at the radial, or other body locations such as brachial, carotid, popliteal, and even superficial temporal comfortably.
The patient wore a modified mountain climber's harness with an adjustable belt around the pelvis and thigh and an adjustable belt above to support their body weight.
Participants were provided with one Actical and ActiGraph fixed directly next to each other on an adjustable belt.
The exercise testing protocol was performed on a single-lane motorized treadmill (Columbus Instruments, Columbus, OH) with an adjustable belt speed (0 99.9 m.min-1).
Participants were instructed to attach the activity monitor to an adjustable belt and to wear it firmly around the waist, positioned just above the right hip.
Animals were restrained in the supine position using three adjustable belts over the abdomen, chest and neck during the scans at 120 kV tube voltages and 150 mA current.
Made of the durable Base Camp material this pack has an adjustable hip belt and two stash pockets.
The 20-watt, water-resistant Sound Rock-it ($220), which comes with headphones, an AC output, remote control, shoulder straps and an adjustable waist belt, is an audio minisystem with tuner, cassette and CD player designed for people on the go.
The monitor was enclosed in a small pocket on an adjustable elasticised belt.
Research assistants helped students place an Actigraph monitor, via adjustable elastic belt, over the right iliac crest, prior to the start of each observed PE lesson, to wear for the duration of lesson.
