Impact Pulley Blocks MS 251 C Model Best For Visibility Style Model Best For Visibility Style Waterproof Rating Key Strength Harkie Defiance Jacket – Grey Professional arborists wanting a slimmer modern waterproof jacket Standard visibility with reflective detailing Full zip jacket EN ISO 343 Class 4:4 Best all round waterproof arborist jacket Harkie Defiance Jacket – Orange Arborists needing waterproof protection with hi vis compliance Hi vis orange for railway and highway use Full zip jacket RainBlok waterproof fabric – Class 4 breathable Hi vis full zip waterproof jacket Harkie Innovation 2 Smock – Orange Tree surgeons and rail teams needing rugged waterproof protection Hi vis orange Half zip smock EN343 Class 4:4 Heavy duty arborist smock with sawdust skirt Harkie Innovation 2 Smock – Yellow Highway and roadside teams needing maximum visibility Hi vis yellow Half zip smock EN343 Class 4:4 Best for roadside and infrastructure work Harkie Forestry 2 Smock – Orange Forestry workers wanting a durable traditional smock Hi vis orange Half zip smock EN343 Class 4:4 Simple rugged forestry waterproof smock Harkie Forestry 2 Smock – Yellow Highway crews and outdoor workers needing durable hi vis wet weather protection Hi vis yellow Half zip smock EN343 Class 4:4 Best simple hi vis smock for highway work Ideal for formative pruning on young trees Designed for high impact rigging scenarios oversized bearings Axle Design Hollow (XS: 10mm L: 20mm) Use Case Impact rigging