Sparco X-Cool Recharge SpecificationsOver time the X-Cool freshness of your Sparco suit or underwear gradually decreases. This refill in tube provides a long-lasting refreshing effect and can be used simply by adding the gel to your laundry in the washing machine. One refill treats a complete racing suit or a set of underwear (shirt underpants and socks).Sparco recommends that the X-Cool treatment be renewed every 10 washes. The product has a shelf life of approximately 6 months.