YES 45 XT High Performance Storefront featuring Dual Thermal Barriers Superior Thermal Performance and Structural Integrity This energy saving storefront system features a dual thermal barrier design to significantly reduce heat transfer and keep internal surfaces warmer. MLP™ (mechanical lock profile) technology delivers superior structural integrity to provide longer vertical spans and horizontal spacings; not to mention its best-in-class thermal performance attributes. Product Options & Features n Outstanding thermal performance utilizing standard 1" insulating glass n Greater efficiency can be achieved with higher performance glass n Screw Spline Assembly n Industry leading Sill Flashing Design n Integrates with Sun Control Products ThermaShade® and Luminance® MLP™ is a trademark of Azon.