Siser Heat Transfer Vinyl (HTV) is the answer to your personalizing projects! Of all the garment decorating methods available, Siser Heat Transfer Vinyl HTV Easyweed is one of the least expensive and easiest to get involved in. Siser Heat Transfer Vinyl (HTV) is either a Polyurethane (PU) or Poly Vinyl Chloride (PVC) material that comes on a clear carrier sheet. Designs are cut from the material while leaving the carrier intact for application.