a refrigerant - transport hose having an inner tube , an outer tube located radially outwardly of the inner tube , and a reinforcing fiber layer interposed between the inner and outer tubes , the reinforcing fiber layer and the inner and outer tubes providing an integral tubular body , and inner tube including a gas - impermeable resinous layer formed of a composition containing a polyamide resin produced by reaction of hexamethylene diamine and an aliphatic dicarboxylic acid having eight to sixteen carbon atoms .