Ty DIY Edition Shower Curtain 100% High-Density Polyethylene (HDPE) Made in USA Ty is a simple number 2 plastic shower curtain. Unlike other shower curtains made of vinyl, Ty will not off-gas in your home. Also unlike vinyl, Ty breathes, making it less likely to grow gross mold and mildew. Ty is stronger than vinyl and will last a very long time, then it can be recycled. Use the attached permanent marker to draw a custom design on Ty.