Flexible bottle that reduces in size as you drink to minimize spillage or bouncing of the liquid inside. RECOMMENDATION BEFORE FIRST USE Rinse with lemon juice (50%) and water (50%) leave the mixture inside for 2 hours and rinse with plenty of water. TECHNICAL INFORMATION Composition of the soft flask, all BPA free: Bottle body: Thermoplastic Polyurethane (TPU). Dimensions: 9 x 9 x 27.5 centimeters Cap: Polypropylene (PP). Teether: Silica Gel