Personalized I Love My Gumpa Bright Rainbow Grandchildren Gift T-Shirt. Whether it's for Christmas, Father's Day, or a birthday celebration, this gift idea is sure to bring a smile to any grandpa's face. The beautiful and cute design, combined with the sentimental message, makes it a cherished keepsake for both the grandchild and the grandparent. Show your love and appreciation for your grandpa with this special gift that celebrates the bond between generations. 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.