Moloney-MacDonald says smaller ball 'challenging'

Ireland hooker Cliodhna Moloney-MacDonald admits she has found the smaller ball being trialled in women's rugby "challenging" in the build-up to Sunday's game against the United States.

World Rugby is trialling a size 4.5 ball - about 3% smaller than the size five used in the men's game, but the same weight - during September and October's WXV Global Series.