Service tee by CAT WWR. Cotton jersey tee inspired by CAT’s workwear heritage features graphics at the left chest and back, complete with a ribbed crew neck and short sleeves. Historically rooted in the resource and construction industry, CAT knows workwear. CAT WWR is Caterpillar Workwear redefined, capturing the true spirit of American workwear with everyday products that focus on authenticity, ingenuity and craftsmanship.