That jacket is highly waterproof so it completely repels the rain.
That waterproof jacket is of high quality so it repels the rain.
That jacket is highly waterproof and designed for mountaineering so it completely repels the rain.
「そのジャケットは高い防水性で、雨を弾く」＝ That jacket is highly waterproof so it completely repels the rain. / That waterproof jacket is of high quality so it repels the rain. / That jacket is highly waterproof and designed for mountaineering so it completely repels the rain.
ボキャブラリー
highly waterproof ＝ 高い防水性
completely ＝ 完全に
repel ＝ 弾く
rain ＝ 雨
high quality ＝ 質が高い
designed for mountaineering ＝ 登山用
イギリス 
