Aritzia Sunday Best Sinch Smooth Willow T-Shirt Seamless Crew Neck Brown Medium Content: 94% nylon, 6% elastane Worn once Constructed with minimal seam lines for a smoothing look and body-hugging feel This is a crewneck t-shirt designed to fit tight. It’s made with Sinch Smooth — a body-hugging fabric that forms to your shape for a perfect fit. Seamless construction provides a smooth look and an ultra-comfortable feel.