{
  "condition": "minecraft:entity_properties",
  "entity": "this",
  "predicate": {
    "equipment": {
      "legs": {
        "predicates": {
          "minecraft:enchantments": [
            {
              "enchantments": "survivalplus:sprinter",
              "levels": 3
            }
          ]
        }
      }
    }
  }
}