To minimize overheating, costumes included a built-in fan, and optional cooling vests were made available. Parts of the mascot production process were captured in the documentary, Beyond Gold: The Journey to the first Youth Olympic Games, which was commissioned by the Singapore Youth Olympic Games Organising Committee (SYOGOC). Mascots The mascots' designers created elaborate descriptions of Lyo and Merly, which are summarised below: Lyo's name is the initials (L.Y.O.) of "Lion of the Youth Olympics", while Merly's name is a combination of mer, which means the sea, and the letters L and Y which stand for liveliness and youthfulness. The two characters allude to the "Lion City" label of Singapore, and the Merlion, a national symbol of Singapore, respectively. Lyo's mane resembles the Flame of Passion of the Spirit of Youth, the emblem of the Games. It is also a reference to the Singapore 2010 bid tagline "Blazing the Trail". The pad on his paw is shaped like the island of Singapore. Merly is vegetarian due to "a deep respect for all living creatures", and her paw pad is shaped like a heart. Outreach The two mascots were officially introduced by Minister for Community Development, Youth and Sports Dr. Vivian Balakrishnan on 21 November 2009 at Suntec City. He commented that the duo are "an interesting play on fire and water". He added that "there are aspects of [the mascots] we clearly can identify with as Singaporeans, but really what we hope is these mascots will be embraced by Singaporeans as well as the visitors who come". Before and throughout the Youth Olympics, the mascots appeared in various activities and programmes, including events in schools, launches and roadshows. The Olympic theme featured in Singapore's 2010 National Day Parade, also held in the month of August, and Lyo and Merly participated in pre-parade activities. Lyo and Merly were also widely featured in Games memorabilia sold at the official Youth Olympic Games Superstore in front of Ngee Ann City shopping centre on Orchard Road, Singapore's main shopping street, and at competition venues. Male medal winners at the Games are presented with a Lyo plush toy during victory ceremonies, and female winners receive a Merly toy. Four postage stamps depicting the mascots in poses featuring the Games' Culture and Education Programme (CEP) and Olympic sports were also launched by the SYOGOC and Singapore Post. In addition, a limited-edition Singapore 2010 Youth Olympic Games