ENGINEERED SUPPORT - NOT A TRADITIONAL PILLOW: Built for extended naps, the Evolution X Neck Pillow is intentionally engineered to feel different (like a well-fitted new shoe, a brief adjustment period may be needed to get used to our unparalleled chin support). At its core are precision-designed plastic support shells, crafted for reliable neck support that flawed, traditional pillows cannot provide ADJUSTMENT #1 - CHANGE THE CIRCUMFERENCE OF THE PILLOW TO FIT YOU: One-time adjustment! Unzip the back zipper to release and secure the strap to adjust the circumference of the pillow to your preferred fit ADJUSTMENT #2 - CUSTOMIZE PILLOW TO YOUR EXACT NECK HEIGHT: It is the ONLY pillow that fits to you rather than you having to fit it. Shift top or bottom pillow lobes to dynamically adjust to your preferred height ADJUSTMENT #3 - FINE TUNE FOR CUSTOMIZED SUPPORT: Pull the cord and ball lock through the closure ring, then press the button and slide to adjust VERSATILE NECK SIZE COMPATIBILITY: Designed to accommodate most neck sizes ranging from 11 to 21 inches in circumference, ensuring a comfortable and secure fit for a wide variety of users during travel PREMIUM MEMORY FOAM CONSTRUCTION: Features high-quality memory foam that contours to your neck and head, providing superior comfort and support throughout your journey CONVENIENT TRAVEL COMPANION: Includes a compact carrying case that makes it easy to pack and transport, ensuring your neck pillow is always ready for your next adventure Where first class comfort meets customizable support. The first pillow that adjusts to you, with three ways to adjust the Evolution X provides you with the opportunity to customize the height, circumference, and closure to your preferred fit. X-perience the difference when comfort and support perfectly intersect to provide an extraordinary travel experience.