Shop the Boston Celtics Store at Rally House for a great selection of officially licensed hats and caps. Rally House offers the largest selection of team hats from the Boston Celtics including beanies, knit hats and baseball caps for Celtics fans of all ages. With exclusive offers throughout the year, Rally House is the number 1 shopping destination for great Boston Celtics hats. Are you looking for other Celtics products? Look no further! Shop Celtics hats, apparel, and accessories. Go Celtics! The cold weather is upon us. Make sure you are always prepared with a knit hat to keep your head warm. Rally House has the best selection of beanies for all of your favorite teams.