By using soap in a flannel, you are supporting the Campaign for wool, the British sheep farming industry, including those who keep rare breeds, the British wool manufacturing and retail industry, The English soap manufacturing and retail industry and an artisan.  Plus, as the soap is made with sustainable palm oil you are helping to preserve the rainforests in Indonesia and Malaysia. Orangutan numbers in Borneo have more than halved between 1999 -2015 as their habitat is destroyed due to the expansion of palm oil plantations.
Wool takes a short time t0 biodegrade in soil, adding nutrients back to the earth, more recent studies have shown that wool also biodegrades in the ocean and water, and so does not impact the planet with microfibre and plastic pollution It takes about five times more energy to produce liquid soap; liquid soap requires more plastic packaging, as it contains water it is heavier to transport than soap bars and therefore has a larger carbon footprint and usually contains petroleum.  Simple soaps also contain less chemicals and preservatives.  As sheep reproduce fleece the wool is renewable.Wool gently exfoliates your skin and the wool around the soap helps prolong the life of the soap. So, it lasts longer! Felted Soap is also a lot easier to hold than a slippery bar of soap and the wool has antibacterial properties.