The product's environmental impact is calculated over its entire life-cycle and using several different indicators. An overall rating (ABCDE) is generated to help you easily identify those products which have the best environmental performance by comparing products of the same type (T-shirts, trousers, backpacks, etc.).
Decathlon has voluntarily adopted this policy of displaying environmental information.
Explanation video: https://youtu.be/8t63KkRwn_8