What is the difference between Heather and Solid apparel

Heather T-Shirts, More Than Gray

7305-ROY-S-SOLID, BG7305

Fabric options for customs - Girls accessories

Faherty Brand Long-Sleeve Luxe Solid Heather Polo in Flint Heather Men Shirt XL

Fabric options for customs - Girls accessories

NIN Life Classic T-Shirt for Sale by EndGameApparel

SEE SEE FONT LOGO CREW【GREY】

Fabric options for customs - Girls accessories

Vintage Gap Black Heather V-neck Long Sleeve Solid Sweatshirt Adult Size XL

What is the difference between Heather and Solid apparel? – Fabricated Customs