Purinas Wind and Rain® Fly Control with Altosid® (IGR) is a line of beef cattle minerals helps prevent the breeding of horn flies in the manure of treated cattle; designed to address the mineral deficiencies of the available forage in a palatable, weather-resistant, granular formula. Wind and Rain® Storm® cattle minerals large particle size and special formulation keeps the mineral from absorbing water and blowing out of the feeder. Click here for guaranteed analysis and more information.