Loose slots are online casino games with high RTP combined with high volatility. Low volatility games generate small winnings, while big volatility slots pay better, but there is always the danger of long dry spells. High variance slots are riskier since winnings are less frequent. So, if you are prepared to spend money chasing down a massive win then play big variance slot machines. If, you can’t handle the stress and want more frequent wins, then you should choose low variance games.