The ULINE Insulated Mailer Metalized Envelopes are designed for cold shipping, making them perfect for keeping items at the desired temperature during transit. These 9 x 12 envelopes come in a convenient 10 pack, ensuring you have plenty on hand for your shipping needs. The metalized material adds an extra layer of protection and insulation, making it ideal for sensitive items that require careful handling and shipping conditions. Trust in ULINE to provide reliable and high-quality packaging solutions for your business or personal use.