The M357 is used to increase neck strength and mobility through forward and lateral flexion, extension and rotation exercises.  (see below for size info.)

he M357 comes with a head harness with four attachment points, a 2ft/60 cm modular tubing with 1.5 – 4.5 lbs (0.68 – 2.0 kg)* of pull, and a door mount. Note: Headset should fit snugly around head. Choose smaller size if in-between sizes. Interchangeable.

X-Small: 18.5″-19.6″ (46.9-49.8cm)
Small: 19.6″-21.2″ (49.8-53.8cm)
Medium: 21.2″-22.4″ (53.8-56.9cm)
Large: 22.4″-24.0″ (56.9-60.9cm)
X-Large: 24.0″-25.1″ (60.9-63.8cm)

*Resistance when stretched 1-3 times original length.

Delivery: 14 - 21 days