Tempurpedic neck pillow size medium for king

Still has box, only used 1x but too big for me, essentially brand new FEEL: Firm DESIGNED FOR: Back or side sleepers MEASUREMENTS:* Small: 20 x 12.5 x 3.5 Medium: 20 x 12.5 x 4 Large: 20 x 12.5 x 4.75 Travel: 10" x 12" x 4" *All sizes are approximate. Reference the NeckPillow Size Chart with Measuring Guide in the images carousel to determine the correct size and fitment. FEATURES: Ergonomic shape in small, medium, large TEMPUR-Material™ adapts to your shape 100% polyester knit hypoallergenic cover Removable and washable cover