Thank you for viewing! ▪️First come, first served! ▪️Initial defect warranty included ▪️Ships within 48 hours ▪️Discounts available for bulk purchases We also have various types of neck coolers for sale. Please let us know if you'd like to purchase multiple items, as we offer discounts for bulk purchases. NASA Phase Change Cooling System: Employs 28° phase change PCM gel using NASA technology. 100% genuine German-imported biodegradable PCM filling improves gel purity by 30%. PCM filling extends cooling duration by 80% + 130% (TÜV SÜD verification: 131% extension compared to competitors in a 30°C environment). TÜV SÜD tests show a cooling effect lasting 98 minutes at 30°C, significantly surpassing similar products on the market. Cooling ability recovers simply by leaving it at room temperature, and it can be used easily by playing in water for 20 minutes or refrigerating for 10 minutes. Convenient for everyday use. Innovative Triple Leak Prevention Technology & Easy Care: Integrates innovative bio-barrier film technology and triple leak prevention technology to thoroughly prevent condensation. Passes a 20,000-cycle pressure test, exceeding the German high-quality 95A TPU JIS S 4057 (cooling durability standard) by 200%, and is 60% more durable than commercially available 90A materials. JIS waterproof grade 5 certified, and treated with stain-resistant processing, so dirt such as sweat and sunscreen can be easily wiped off. Biomimicry Anti-Slip & Precise Fit: Shark skin hydrodynamic surface treatment improves vertical friction by 23%. Achieves a drop rate of less than 0.3% (3.7% compared to conventional products), providing a stable fit even during intense exercise. [Japanese Modern Aesthetics x Highest Safety Standards] Employs German Braun's matte etching technology, creating a sense of luxury. The logo-less design highlights the original texture and luster of the product. By directly injecting biomimicry pigment particles into the material, vibrant colors are maintained for a long time. After 1000 wash tests, the color fading rate is less than 0.001% (much more durable than conventional ink-printed products). Japan ST safety certification and German TÜV biodegradability certification (BPA and plasticizer free). Safe for sensitive skin and children aged 6 and up. We have many other wonderful products for sale! Further discounts are available for bulk purchases! #AinoShop Management Number: 14-869$$580