Check the listing for details. THORO Systems vintage Ad Tshirt. Condition: New with tags. Listed at 24.99 USD. Thoro System Products was founded by Edward H. Canon, a construction engineer. Canon developed the Thoro System of waterproofing to end the many disappointing and frustrating methods that were available to contractors of the period. With the help of his brother, Benjamin, Canon developed his own formulas, improved them from job to job and eventually formulated the products Thoroseal, Waterplug and Quickseal. They also had one of the coolest matchbooks ever- i sent them a message on Instagram and they said hey, go ahead and put it up there. Awesome folks at Thoro. Thanks! This classic unisex jrsey short sleeve tee fits like a well-loved favorite. Soft cotton and quality print make users fall in love with it over and over again. These t-shirts have-ribbed knit collars to bolster shaping. The shoulders are tapered for a better fit over time. Dual side seams hold the garment's shape for longer. .: Made with 100% Airlume combed and ring-spun cotton, a lightweight fabric (4.2 oz/yd² (142 g/m²)) that is easy to layer, breathable. Perfect for active and leisure wear. .: The retail fit that is perfect for casual and semi-formal settings. The crew neckline adds a classic, neat style that's perfect for accessorizing..: Bella+Canvas manufactures all its products in the US and internationally in humane, no-sweat-shop, sustainable way and is part of the Fair Labor Association as well as Platinum WRAP certified. .: The tear-away label minimizes skin irritations..: Fabric blends: Ash and Heather Prism colors - 99% Airlume combed and ring-spun cotton, 1% polyester; Heather and Solid Blend colors - 52% cotton, 48% polyester; Athletic Heather and Black Heather - 90% cotton, 10% polyester.