Advanced Plastic Stacking Chair with Seat Pad Heavy-Duty Shell. 6 Year Guarantee. Made in the UK. Featuring the popular Advanced shell providing great comfort through its contoured seat and airflow backrest. The Advanced plastic shell is the most popular option in it’s class for leisure & community centres. 50 upholstery shades to choose from. Available in any of 15 standard shell colours and four standard frame finishes.