The mistake new operators make: they buy framing-style boots because that's what their dad wore. A framing boot is for walking. An operating boot is for sitting, climbing in and out of a cab, and pivoting your foot on pedals. Different geometry.
The right operator boot is a 6-inch waterproof lace-up with a flexible sole, a defined heel, and a moderate weight. You want a heel because you're using foot pedals and a flat wedge sole slides on them. You want flexibility because you're not pounding nails.
The popular ones at the shop for excavator and backhoe operators: the Irish Setter 83607 Ramsey Pro, the Red Wing Iron Ranger if you want a non-safety-toe option for shop work (not the cab), and the Wolverine Overpass 6-inch with CarbonMax composite toe. The Carolina CA1809 wide-fit is for big-footed operators who hate their cab boots.
Steel vs composite for operators: composite. You're not on a job site walking around — you're sitting in a heated cab and the steel toe will draw cold off the floor of the cab in winter. Comp toe runs warmer.
Insulation depends on the cab. Most modern excavators have heat. So an insulated 600-1000g boot is overkill. 200g Thinsulate is plenty for an operator. If you're in an older Cat that doesn't heat right, then 600g.
Pants: this is where operators are different. You don't need reinforced knees because you don't kneel. You need pants that aren't binding at the hip and waist when you're seated nine hours. The Carhartt Rugged Flex Rigby Five-Pocket is the right answer. The Truewerk T2 is the lighter weight option. Avoid the Double-Front pants — the extra fabric on the knee bunches in a cab.
Shirt: long or short sleeve depending on weather. The cab is climate-controlled in modern equipment. Carhartt K87 short-sleeve pocket tee for warm, Carhartt K128 long-sleeve henley for cool. A button-up over a tee is fine for older operators who like the look.
Outer layer: light. A Carhartt Rain Defender pullover or a Carhartt Detroit jacket without the heavy bib. Heavy parkas in a cab are sweat factories. Save the Yukon Extremes for the walk to the equipment.
Gloves: light. A Mechanix Original or a leather palm work glove for getting in and out of the cab and doing greasing/maintenance. Heavy gloves on operating controls reduce feel and you'll over-correct. A lot of operators run controls bare-handed and put gloves on for ground work.
Hard hat: ANSI Class E inside the cab if it's a job site rule (most are). Vented for summer.
Eye protection: tinted safety glasses or polarized work sunglasses. The reflection off equipment glass in summer is brutal.
Hearing protection: most modern cabs are sealed and quiet. Older equipment isn't. NRR 25 plugs or muffs as needed.
Hi-vis vest for getting out of the cab in a live work zone. The Ergodyne GloWear 8210Z Class 2 vest goes over whatever you're wearing.
Spotter belt or a wrench bag: most operators do their own greasing and maintenance. A small canvas tool bag with a 13/16 wrench, 9/16, a grease gun (Lincoln 1162 lever-action), a roll of paper towels, and a quart of fuel/hydraulic. You don't need a tool belt.
The thing seasoned operators tell rookies: get out of the cab every two hours and walk. Sitting nine hours is its own injury. Plantar fasciitis, lower back issues, and DVT are real for operators. The boot doesn't fix that — getting out of the cab does.
Operating is sitting work. The kit is lighter, the boot is more flexible, the pants don't need reinforced knees. Buy for the actual work.