Personalized Sigma Claus Funny Christmas T-Shirt. Celebrate the holidays in style with the Sigma Claus Funny Christmas design, which combines traditional elements with a fresh, humorous twist. Perfect for gifting or personal use, this design embodies the joy and merriment of the season while showcasing your unique personality. Make this Christmas memorable with a touch of fun that resonates with the spirit of the holidays. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.