It is important that you look at more than just the size of a product before making your purchase! Another thing to consider is how many people will be using it and for what purpose (e.g., cooking, camping). If there are multiple users they’ll all need their own blanket so make sure to double-check with them first; otherwise, you could end up purchasing one too many or not having enough when needed most. More than anything else this number typically indicates thickness which means higher numbers correlate directly with better protection against high temperatures – but don't forget about other factors such as weight and length/width measurements too! For these reasons we recommend choosing a brand that offers a variety of sizes and thicknesses to ensure you get the best bang for your buck!