Transfer needs to be used on fabric that is at least 50% polyester, the more polyester, the more vibrant the transfer will be . A 50% polyester item will give you a nice vintage look.
I recommend using 65% Polyester fabric or more for a vivid look. 
The shirt/fabric must be a light colored fabric. NO BLACK or dark fabric. It will not show up!
These transfers will not print white! If there is any white in the the image it will become the color of the shirt you put the transfer on.

Due to differences in monitors, the colors shown on the listing may slightly differ from colors on transfer. Also, the transfers may appear a different color on paper but once it is heat activated the colors come to life :)

Sizing is determined by the longest side of design.

You will need a heat press to use this transfer, an iron will not get hot enough.

General instructions are as followed for shirts but adjustments may need to be made depending on your personal heat press and its abilities. Other sub material time and temp guide is included in listing photos