◆ Alphax Neck Supporter Cervical Collar Height Adjustable Doctor's Neck Supporter Fit For those with straight neck, etc. I tried it on over a turtleneck. It's almost new. Please refrain from purchasing if you are concerned about minor details. ・Easy on the neck just by wrapping it! A neck and cervical spine supporter that supports the heavy head just by wearing it. ・Height can be adjusted with the two-piece plate. Shortest approx. 8cm, longest approx. 11cm. The plate has ventilation holes, and the side fabric is mesh for good breathability and less stuffiness. ・Suitable size: Neck circumference 30~46cm Product size: Length 8 x Width 57.5 x Thickness 1.7 (cm) Weight: 100g Material: Main fabric: 100% polyester, Filling: Polyethylene