Personalized Ohm Tree Toddler T-Shirt. A tree filled with the ohm symbol and edged in a bit of resistance is a fun winter holiday and Christmas gift design for electricians and electrical engineers. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.