Adjustable pillow core height from 5 cm inclusive to 10 cm exclusive, with a butterfly shaped core for ergonomic neck and head support. Suitable for adults. Core material is memory foam. Outer jacket material is a blend of polyester fiber and lyocell fiber. Inner sleeve material is white sweatcloth. Color options: light gray, sky blue, mint green (three colors available). Pillow core weight: memory foam pillow core weight 2 kg inclusive 3 kg not included. Key benefits: supports neck and head alignment, adjustable height to fit different sleeping positions, durable memory foam construction, and breathable fabric combination. Use scenarios: Night sleep: adjust height to maintain proper spinal alignment and reduce neck strain. Lounge or read: place on bed or sofa to provide stable head and neck support while watching, reading, or resting. Desk or work setting: use for neck support during long periods of reading or computer use to improve comfort and posture.