Overview The IMSA WeatherTech SportsCar Championship is the International Motor Sports Association's top sports car championship, a North American series where four classes of car share the track in the same race - hybrid GTP prototypes, LMP2 prototypes and GT cars in GTD PRO and GTD - and the season opens with 24 hours straight at Daytona. The calendar runs 11 championship rounds, from the Rolex 24 at Daytona in January and the Twelve Hours of Sebring in March through street races in Long Beach and Detroit, Watkins Glen, Road America and Indianapolis, to Motul Petit Le Mans at Michelin Raceway Road Atlanta in October. Race lengths run from 100 minutes on the street circuits to 24 hours. IMSA recently counted 18 manufacturer partners and 22 corporate partners, and its endurance races connect to the 24 Hours of Le Mans. On site Race weekends run two to five days, and support series run alongside the main event - the Michelin Pilot Challenge, the VP Racing SportsCar Challenge, the Mazda MX-5 Cup and Porsche Carrera Cup - so the track carries racing from morning practice to the feature. Petit Le Mans starts at midday and finishes after dark, ten hours later. Most rounds run on permanent road courses the series calls park-like, two on city streets, and the team transporters stand facing the fans. IMSA's WeatherTech VIP Club is its own hospitality venue at each event, where partners host guests among the automakers and teams, and VIP programs add hot laps with professional drivers in cars from brands such as Aston Martin, BMW, Lamborghini, Lexus, McLaren, Mercedes-AMG and Porsche, and guided tours of the paddock and pit lane. Audience IMSA puts its following at more than 10 million auto enthusiasts, at the track, online and on NBC Sports, and its weekly IMSA Insider newsletter goes out every Thursday to 260,000 fans and stakeholders. IMSA's research, cited in its partner materials, finds its fans 21 and over drink spirits well above the rate of non-fans, with scotch at an index of 178 and brandy at 250. About 35 percent of IMSA.com's audience is outside the United States. Track record In the U.S. the races air on NBC Sports; outside it, IMSA produces its own world feed, carried on linear television in 148 countries and streamed on YouTube and IMSA.tv, with audio on SiriusXM and the IMSA app. At a recent Indianapolis round, BMW M Team WRT won its first IMSA race on a late pass by Sheldon van der Linde, and Ford beat Chevrolet in GTD PRO. The season closes with the WeatherTech Night of Champions, an awards night for teams, drivers and partners, most recently held at Chateau Elan outside Atlanta. Brand presence WeatherTech holds the championship title, and individual rounds carry their own title partners, from Rolex at Daytona to Mobil 1 at Sebring, Motul at Petit Le Mans and TireRack.com at Indianapolis. A season-long partner can use IMSA's marks and designations, photos and footage in its own marketing, run its branding on the world feed and on IMSA's transporters as they travel to each race, and integrate product into the VIP Club. Partners also get a seat in IMSA's marketing workgroup with the other corporate and manufacturer partners, and introductions to team owners and drivers through the season.