What the Heck Is UK grain free equine feed?

https://daily-horse-feed498.zenbloomer.com/posts/rules-of-sustaining-horses-for-pony-club-riders

Gentle horse feed for sensitive stomachs, designed to support comfortable digestion, hind gut health and efficient nutrient uptake. A low-starch fiber-rich formula with naturally sourced ingredients to help maintain calm digestion and overall health.