-20% discount on top of regular discount only applies to products and sizes where the delivery time is stated as "in stock 1-2 days" and "external warehouse 2-6 days". If a product has a delivery time for size M - "in stock 1-2 days" and for other sizes the delivery time is "2-4 weeks", then the discount only applies to size M with a delivery time of 1-2 days in stock.
