Letraset was a company known mainly for manufacturing sheetsartwork elements that can be transferred to artwork being prepared. Kind of like prepackaged Photoshop design bits for the analog Mad Men, mid-century era of design. They looked like this: 
We probably should have put our set on eBay but instead we made a cap

Made in Italy

100% Polyester.  We sourced the best cotton hand-feel poly from Italy that is fully printable.  

One size fits most