Secures in back of neck with hook and loop (velcro-type) closure. Add your initials, name or department to the collar. Embroidery is positioned on the upper left side and is limited to 30 characters on one line. Embroidered items are not returnable. SIZING: Neck circumference, Small: 10” to 14”, Medium: 15” to 17”, Large: 18” to 20”, Extra Large: 21" to 23 Minimizes scatter radiation exposure to the thyroid area Patented XPF® Technology contains no lead or heavy metals; non-toxic Provides 0.5mm lead equivalency over the thyroid area and 0.25mm in the remaining areas Machine washable; can be wiped down for cleanliness Lightweight, flexible, fits comfortably around neck Made in USA Makes a great gift for a graduating medical student Fun patterns: Bones, Camouflage, Hearts, Hops, Jungle Flowers, Rainbow Hearts, Tie Dye, Outer Space, Skulls, Tartan, Tropical Floral, Geometric Neon, USA Stars, Tulips, Scary Skulls. (All fabric options.) See all Thyroid Collars. Visit the BLOXR website.