The Tree Dasher 2 is lighter making it among the lightest running shoe options. The lug pattern has been updated to improve traction and create more grip, and so the midsole with Allbirds SweetFoam becoming more plush, lighter and more comfortable. The eye-catching heel design, which is more angular than your typical runner, is designed to reduce the weight in the heel while improving the crash pad, while minimizing slippage.