Carhartt developed Insite Technology Footbeds so you can end the day as strong as you start it with engineered comfort that feels like a custom orthotic in your boots. This footbed design is based on 120,000 3D foot scans for fit, form and comfort and provides maximum arch support to reduce foot fatigue during long days on the job. Pulsion energy foam is engineered for maximum rebound to further prevent fatigue. Single density PU foam is specifically chosen for its compression set and ability to work with Pulsion foam. The unique Tetrapod design disperses compression in multiple directions while maintaining its shape. Ax suede covering minimizes foot slipping in boot by providing 30% more grip.