2019 Detroit Tigers On-Field Therma Base Premier Jacket. Brand new for the 2017 Tiger's season. The 'Detroit' script is an applique sewn center chest and the English D sewn on the left sleeve. The jacket is lined in warm fleece using Majestic's Therma Base technology to keep you warm and comfortable. There are 2 front pockets and one inside pocket. 100% Polyester.