Old Navy Loose Mock-Neck Side-Zip Sweatshirt We love the idea of wearing this Loose Mock-Neck Side-Zip Sweatshirt ($30) over all of our workout clothes. It's cosy and made with a soft-washed fleece. Image Source: oldnavy.gap.com Loose Mock-Neck Side-Zip Sweatshirt $30 from oldnavy.gap.com Buy Now