Sports Basement has a great selection at the lowest prices in SF and the staff is very knowledgable. They've helped me get great running shoes and perfect hiking boots. Always my first stop when I need anything for working out or for the outdoors (I've gotten super deals on fleeces and long underwear for camping, etc). It's kinda in a weird spot but parking is not an issue.
Pros: great selection, low prices, helpful staff
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