4 Laps to Go: Mile, 1600m Crew neck 2 oz/yd² (142 g/m²))

2 oz/yd² (142 g/m²))

Heartbreak Hill

Prepare for a broken heart

but the Boston Marathon runs through Heartbreak Hill

- Includes side seams for improved shape retention and structural support

4 Laps to Go: Mile, 1600m Crew neck 2 oz/yd² (142 g/m²)).: Made with 100% Airlume combed and ring spun cotton, a lightweight fabric (4. 2 oz yd (142 g m)) that is easy to layer, breathable. Perfect for active and leisure wear. .: Fabric blends: Ash and Heather Prism colors 99% Airlume combed and ring spun cotton, 1% polyester; Heather and Solid Blend colors 52% cotton, 48% polyester; Athletic Heather and Black Heather 90% cotton, 10% polyester.