The invention relates to a de-icer or anti-icer composition for a travelled surface comprising: at least about 25% w/w of at least one acetate salt; and from about 14% to about 50% w/w of at least one non-acetate salt wherein the total concentration of said at least one acetate salt and said at least one non-acetate salt in the de-icer or anti-icer composition is at least about 57% w/w. The acetate salt can be selected from the group comprising potassium, sodium, lithium, magnesium, calcium, ammonium acetate or mixtures thereof. The non-acetate salt can selected from the group comprising one or more cations selected from the group consisting of potassium, sodium, lithium, magnesium, calcium, ammonium or mixtures thereof and one or more anions selected from the group consisting of formate, propionate, butyrate, isobutyrate, oxalate, malonate, succinate, glutarate, adipate, citrate, gluconate, benzoate, carbonate, bicarbonate, fluoride, chloride, bromide or mixtures thereof. The balance can be solvent and optionally not more than about 5% w/w in total of one or more auxiliary or incidental additives.