Rio Grande City High School Rattlers Shop Features Rio Grande City High School Rattlers T-Shirts, Sweatshirts, Hats & Jerseys. SpiritSchoolApparel.com is your leading source for Rio Grande City High School Rattlers Apparel, Merchandise, Gear, Sportswear and Clothing for every sport and activity! Choose a variety of Rio Grande City High School Rattlers Merchandise including T-Shirts, Sweatshirts, Hoodies, Hats and Jerseys. Customize your design and personalize the back of your Rio Grande City High School Rattlers Gear to show your Rattlers spirit and support your favorite sport team!