Per the supplier specifications on this product. The versatile ThermoVest™ can accommodate 2, 4, or 6 Ice Pack Strips, depending upon your cooling needs and weight restrictions. Velcro "wings" provide a wide range of adjustment and a snug fit, critical for efficient body cooling. Comfortable over-the shoulder design affords even weight distribution. One shoulder releases to allow quick doffing and donning, even when wearing head gear or backpacks. Ice Strip pockets all open from one side to speed change-outs for longer stay-times.
Per the supplier information on this product it a a tough, solid stainless steel jack chain, open and close links to adjust to size needed. Approximately 25 links per foot and approximately 10-12" is enough to fasten one tag. Standard package has 50' of chain.