Day 13 is here in the Reebok Pump Twitter contest giving away a pair of limited edition Pumps each day from now ’til November 20th. To win today’s pair, simply tweet a pic or link to your favorite 20th Anniversary Pump collaboration release so far. Direct your response before Midnight EST today to @Reebok and use the #PumpCollab hashtag. You can also follow us here @counterkicks for the latest sneaker news, Reebok Pump 20 updates, and our own Twitter contests coming soon. Look for our exclusive Reebok Pump Chronology piece coming later today.