100% STAINLESS STEEL FOR YEARS OF USE AND ABUSE. INTERNAL COPPER LINING MAINTAINS IDEAL TEMP. SWEAT-RESISTANT DESIGN, LEAVES NO RINGS. OTTERBOX LIMITED LIFETIME WARRANTY. FROM CONCERTS IN THE PARK TO MEANDERING HIKES TO KID SPORTING EVENTS, ELEVATION 28 CARRIES THE HYDRATION YOU NEED.. DESIGNED FROM RUGGED STAINLESS STEEL TO WEATHER YEARS OF USE AND ABUSE, YOUR 28-OUNCE CONSTANT COMPANION IS READY TO KEEP YOUR FAVORITE BEVERAGES THE RIGHT TEMP EVERYWHERE YOU GO.. COMPLIES WITH PROP 65. 3.75" W X 10.375" L X 3.75" H