27+ Years of Manufacturing Experience
Custom Hot & Cold Pack
Manufacturer for Global Brands
OEM/ODM Development and Quality-Controlled Production
1999
Manufacturing since
6,000 m²
Production facility
100+
Mature product designs
2
China & Cambodia factories
Global
Compliance support
Industry Solutions
Tailored hot and cold therapy solutions for personal care, sports recovery, outdoor use, post-operative care, and pet wellness.
Personal Care
Specially designed for daily personal care at home, it provides a physical relief solution for various daily discomforts across all scenarios. It can be used for both cooling and heating, and is convenient and easy to use. It is a must-have item for daily health care for the whole family.
Sports Injuries
A professional-grade cold and hot compress solution tailored for athletes, covering emergency cold compress for acute injuries, post-exercise fatigue relief with hot compress, and injury prevention and rehabilitation assistance suitable for all sports scenarios.
Outdoor Camping
Tailored for outdoor travel scenarios such as camping, hiking, mountaineering, and self-driving, this product combines food preservation and emergency care into one, thoroughly addressing the temperature control needs in outdoor environments without power supply.
Postoperative Care
The medical-grade standard postoperative cold and hot compress solution is mild and hypoallergenic, with precise and controllable temperature, aiding in postoperative swelling reduction and pain relief, and providing safe physical soothing care for home postoperative rehabilitation.
Pet Care
The pet-friendly cold and hot compress pack is specifically designed for pets such as dogs and cats. It is non-toxic and resistant to biting, making it suitable for home care in various scenarios such as sprains, arthritis, postoperative recovery, fever reduction, and more.
Customization Process
We can accept ODM/OEM orders. We have the ability to research and design, and can develop and produce customized products according to your design. Click the button below to see how we do each step!
View customization details
CONSULTATION
Communicate your needs and product requirements.
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DESIGN &DEVELOPMENT
We provide professional design and customized solutions.
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QUOTE & ORDER
Confirm the plan, quotation and order details.
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PRODUCTION
Mass production with strict process control to ensure consistent quality.
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DELIVERY
Custom packaging and reliable shipping coordination for safe, on-time delivery.
Material Customization
We help you balance touch, durability, cost, compliance and thermal performance—then document the specification for repeatable production.
OUTER MATERIAL
- PVC
- TPU
- Nylon
- Lycra
- Other
THERMAL CORE
- Gel
- Gel Bead
- PCM
- Sodium Acetate
- Other
Quality Control
xFrom raw material inspection to production, performance testing, packaging, and final shipment checks, we follow a structured quality control process to help ensure consistent product quality for every order.
Raw Material Inspection
Strict screening of all rawmaterials for safety andperformance.
In-Process Control
Real-time monitoring ofproduction process to ensurestability and consistency.
Product Testing
Comprehensive tests onleak-proof, durability,thermal performanceand safety.
Final Inspection
100% visual and functionalinspection before packingto guarantee productquality.
Secure Packaging& Delivery
Professional packagingand reliable deliveryto protect your goods
Dongguan Zejin Biotechnology Co., Ltd. - Cryozin
Cryozin Dongguan Zejin Biotechnology Co., Ltd., founded in 1999, is a professional enterprise specializing in the development, sales and service of ice packs. Based in Dongguan, Guangdong with convenient transportation, we also run an overseas factory in Cambodia to fulfill orders from global customers.Our experienced team implements strict quality control and thoughtful customer service. We provide in-depth customization to fully meet client needs. Our products hold FDA, CE and other certifications, selling well across China and exporting to the U.S., Europe and other regions, winning wide recognition.We welcome orders worldwide. Supported by a professional R&D and customer service team, we assist with both catalog product selection and new product development. Feel free to discuss your purchasing needs with us.International Certification
Our products meet recognized international quality and safety standards, supporting reliable access to global markets.
Best Sellers
We offer over 100 mature cold and hot compress packs and other products, as well as accessories procurement and one-stop service, with a 180 day after-sales standard as the guarantee
Why choose us
Reliable Manufacturing Support
Design & Development
Design& Development
Safety Assurance
Safety Assurance
Production Guarantee
Production Guarantee
Logistics Transportation
Logistics Transportation
Yes, absolutely. Our factory is ISO 13485 certified (Medical Devices Quality Management). All our products meet the stringent safety standards of the US and EU markets. We can provide full documentation, including FDA registration, CE (MDR) certification, MSDS, REACH, and RoHS reports.
Yes, safety is our top priority. The inner gel is 100% non-toxic, medical-grade polymer gel, which is safe for skin contact. The outer shell is made of heavy-duty, puncture-resistant materials (such as Nylon, PVC, or TPU) with advanced high-frequency sealing technology to ensure zero leakage during repeated use.
Yes. Thanks to our proprietary anti-freezing gel formula, our gel packs remain pliable and flexible even at -18°C (-0.4°F). This allows the pack to contour perfectly to any body part for maximum therapeutic effect, rather than freezing into a hard, uncomfortable ice brick.
Yes, we are a direct factory with strong R&D capabilities. We provide full OEM and ODM services. You can customize:
- Product: Shapes, sizes, fabric materials (e.g., plush backing, non-woven fabric), gel colors, and formulations.
- Branding: Silk-screen printing, debossed logos, or custom fabric labels.
- Packaging: Color boxes, zipper bags, frosted bags, or PDQ display boxes suitable for retail.
Manufacturing Support for Global Brands
From product development and quality documentation to production and delivery, our team supports OEM and private-label programs for global customers.
