Caterpillar Lightweight Insulated JacketCaterpillar Lightweight Insulated Jacket Light in weight and heavy on warmth, this jacket includes the features you've come to expect from CAT. Throw it over a flannel or sweatshirt in moderate weather, or wear it under a jacket as part of your layering system on bitterly cold days. To see more from Caterpillar, visit the Caterpillar Collection