Whimsical, playful, full of movement, and performing a classic function. All key words to describe Nathan Allan’s Willow XL Decorative Glass. Part of our Freeform Colection 3D surface patterns, Willow XL railing glass panels are strong, durable, and highly decorative. An added bonus to using Nathan Allan kiln formed glass products is the cleaning feature of sealed, textured glass panels. Each panel is virtually maintenance free and will look new in 20 years.