Store › Blue Original Sigma Sound Studios T-Shirt Design (Blue) Blue Original Sigma Sound Studios T-Shirt Design (Blue) $25.00 Heather Blue Gildan t-shirt. High quality reproduction of the original 1970's T-Shirt with the iconic logo. Heather Blue Gildan t-shirt. High quality reproduction of the original 1970's T-Shirt with the iconic logo. Size: Small Medium Large XLarge Get notified by email when this product is in stock. Sign up to receive news and updates. Quantity: Add To Cart Added!