Everything about this local label keeps the pavement pounder in mind. Fabrics like a proprietary cotton blend and an Italian-made silky technical knit are stretchy and breathable, while stylish details add fun to function. Tracksmith pays homage to classic team-issued training tees with its Grayboy line and nods to 19th-century Cornell track champs with the Van Cortlandt singlet’s “sash.” Peruse the goods at Trackhouse, a store that also serves as a runners’ community center, lounge and library, recently opened a few steps from the marathon finish line.