Package included mountain buggy duet twin maxi cosi car seat 4 options available for infant carrier see drop down menu car seat adapters mountain buggy duet twin cleverly designed and engineered at just 63cm slim at the wheel base duet is no wider than a single buggy taking you and your baby places a side by side double buggy has never been before packed with new features and enhancements the award winning mountain buggy evolution duet offers you more adaptability manoeuvrability dura