Basically does what it says on the tin. Is stopping my energetic whippet cross from jumping over onto the back seat. However, complicated to fit (although good amount of different fittings included). He has already bitten a hole in it in attempt to get through and has nearly got tangled up trying to jump over. Don't think this product would suit a bigger, stronger, or more determined dog. Worth trying out first as price ok but next time will buy a metal grid.