This insulation Add-On on is recommended for when temperatures will be below 55° Fahrenheit. This Add-On covers 1 package! Your package will be lined with high quality thermalized bubble cushioning and a 72 hour Heat Pack, and is available as an ADD-ON for just $8.50! I recommend using this insulation in combination with 1 or more of our 72 hour heat packs! You get one complimentary Heat Pack (Upon request) when you spend $40 or more from my shop!