Podium-level performance. A World Cup race ski for elite-level athletes, the Rossignol X-IUM Premium+ Skating S2 Stiff Ski features a full-length carbon sheet and race-proven edge technologies. The result is an ultralight balanced ski that offers maximum power transmission, glide and fluid acceleration. The S2 build features flex and camber optimized to excel in a wide range of snow conditions. The ski is compatible with the Turnamic® binding system for the most natural ski flex and snow feel.
Ultralight Feel A full-length High Modulus Carbon layup maximizes strength-to-weight ratio and provides optimized energy, power and control
Maximum Power Transmission Total Edge Technology enhances energy activation through the use of full-length ABS sidewalls that regulate camber and provide maximum power transmission and acceleration
Energy Saving Energy Saving Ski tip and tail profiles are optimized for skating with an extremely lightweight, balanced feel for enhanced fluidity, energy savings and reduced swing weight
Ultralight Feel Nomex® Honeycomb core composed of ultra-lightweight aramid fibers in a honeycomb shape with a high strength-to-weight ratio for powerful, elite-level performance
Smooth, Supple Flex Light+ Capless design reduces weight while balancing torsional rigidity with a smooth, supple flex for all conditions stability and increased energy
The Rossignol X-Ium Carbon Premium+ S2 Skate Ski Features:
- Base: K 7000 / Universal 2.0
- Core: Nomex®
- Ski Construction: LIGHT + Teckno
- Dimensions: 40 44 43 43
- IFP Plate
Cross Country Skis are sized and fit on three things, 1). Skier's weight: This is the first and most important thing when sizing or fitting a cross country ski because skis have different stiffnesses. The stiffness of a ski will determine how the ski behaves under the skier. 2) Skiers Height: Longer skis are naturally stiff because of the amount of material used in their construction. So often the skier's weight will dictate the length of the ski, but if given the choice of two lengths the skier's ability should be considered. 3) Skier's ability level: Longer skis are generally faster but can be difficult to control or maneuver for beginning skiers.
Where do you plan on skiing?
This is the first and most important question when determining the correct size ski.
Are you planning on skiing on frozen lakes, on snow-covered golf courses, or in the woods through fresh ungroomed snow?
or
Are you planning on skiing on machined groomed trails at a ski area or local park?
What style of skiing do you plan on using?
Skating: "skiing in which the skis are pointed outward and the skier alternately pushes off one and glides on the other in a motion similar to ice skating."
Skate Skiing must be done on machined groomed trails.
Classic: "skiing in which the skis are alternately pushed forward parallel to each other in a motion similar to walking or running."
Classic skiing can be done on both groomed and ungroomed snow, but different types of skis will perform better in each condition. A racing classic ski, which is long and narrow will be faster in machined groomed "tracks" but may sink under fresh snow and be slow and difficult. While a touring classic ski that is wider and short will be more efficient in fresh ungroomed snow but may be slow and cumbersome in machined groomed tracks.
Classic and touring skis are fit at a different stiffness than skate skis because a classic or touring ski needs to both glide and kick.
Wax and Waxless Classic Skis
Waxable Classic Skis
A Waxable Classic ski can be used in all types of snow conditions and when waxed properly will be the fastest and most efficient option. Waxable Classic skis use kick or "grip" wax on the base of the ski under and in front of the skier's foot (kick zone) and glide wax on the tips and tails. Most Nordic ski racers prefer to use waxable skis because it gives when the ability to make an adjustment based on snow conditions and temperature. 
Waxless Classic Skis
A Waxless Classic ski is a popular option because they do not require a lot of maintenance to perform efficiently. A waxless classic ski may use a fish scale or crown pattern or skin material in the "kick zone" which allows the skier to grip the snow and glide the other ski forward. Waxless Classic skis provide grip in a variety of snow conditions, making them the best option for the skier who wants to "grab and go" and not worry about waxing.
Note: You can still wax the glide zones of your waxless classic ski with glide wax, this will allow the ski to glide faster and further.
Adult Cross Country Skate Ski Size Chart
| Skier Weight | Classic Ski Length | Skate Ski Length | Touring Ski Length |
| 100 - 110 lbs | 180 - 190 cm | 170-180 cm | S |
| 110 - 120 lbs | 182 - 192 cm | 172-182 cm | S |
| 120 - 130 lbs | 185 - 195 cm | 175-185 cm | S |
| 130 - 140 lbs | 187 - 200 cm | 177-187 cm | M |
| 140 - 150 lbs | 190 - 205 cm | 180-190 cm | M |
| 150 - 160 lbs | 195 - 210 cm | 185-195 cm | L |
| 160 - 180 lbs | 200 - 210 cm | 190+ cm | L |
| >180 lbs | 200 - 210 cm | 190+ cm | XL |
Kids Ski Sizing
| Kids Skate | Kids Classic |
| Skier Height (inches) | Ski Size (cm) | Skier Height (inches) | Ski Size (cm) |
| 45 - 50" | 120 - 130 | 30" | 90 - 100 |
| 50 - 55" | 130 - 140 | 30 - 35" | 100 - 110 |
| 55 - 60" | 140 - 150 | 35 - 40" | 110 - 120 |
| 60 - 65" | 150 - 160 | 40 - 45" | 120 - 130 |
| 65 - 70" | 160 - 170 | 45 - 50" | 130 - 140 |
| 50 - 55" | 140 - 150 | ||
| 55 - 60" | 150 - 160 | ||
| 60 - 65" | 160 - 170 | ||
| 65 - 70" | 170 - 180 |
Podium-level performance. A World Cup race ski for elite-level athletes, the Rossignol X-IUM Premium+ Skating S2 Stiff Ski features a full-length carbon sheet and race-proven edge technologies. The result is an ultralight balanced ski that offers maximum power transmission, glide and fluid acceleration. The S2 build features flex and camber optimized to excel in a wide range of snow conditions. The ski is compatible with the Turnamic® binding system for the most natural ski flex and snow feel.
Ultralight Feel A full-length High Modulus Carbon layup maximizes strength-to-weight ratio and provides optimized energy, power and control
Maximum Power Transmission Total Edge Technology enhances energy activation through the use of full-length ABS sidewalls that regulate camber and provide maximum power transmission and acceleration
Energy Saving Energy Saving Ski tip and tail profiles are optimized for skating with an extremely lightweight, balanced feel for enhanced fluidity, energy savings and reduced swing weight
Ultralight Feel Nomex® Honeycomb core composed of ultra-lightweight aramid fibers in a honeycomb shape with a high strength-to-weight ratio for powerful, elite-level performance
Smooth, Supple Flex Light+ Capless design reduces weight while balancing torsional rigidity with a smooth, supple flex for all conditions stability and increased energy
The Rossignol X-Ium Carbon Premium+ S2 Skate Ski Features:
- Base: K 7000 / Universal 2.0
- Core: Nomex®
- Ski Construction: LIGHT + Teckno
- Dimensions: 40 44 43 43
- IFP Plate
Cross Country Skis are sized and fit on three things, 1). Skier's weight: This is the first and most important thing when sizing or fitting a cross country ski because skis have different stiffnesses. The stiffness of a ski will determine how the ski behaves under the skier. 2) Skiers Height: Longer skis are naturally stiff because of the amount of material used in their construction. So often the skier's weight will dictate the length of the ski, but if given the choice of two lengths the skier's ability should be considered. 3) Skier's ability level: Longer skis are generally faster but can be difficult to control or maneuver for beginning skiers.
Where do you plan on skiing?
This is the first and most important question when determining the correct size ski.
Are you planning on skiing on frozen lakes, on snow-covered golf courses, or in the woods through fresh ungroomed snow?
or
Are you planning on skiing on machined groomed trails at a ski area or local park?
What style of skiing do you plan on using?
Skating: "skiing in which the skis are pointed outward and the skier alternately pushes off one and glides on the other in a motion similar to ice skating."
Skate Skiing must be done on machined groomed trails.
Classic: "skiing in which the skis are alternately pushed forward parallel to each other in a motion similar to walking or running."
Classic skiing can be done on both groomed and ungroomed snow, but different types of skis will perform better in each condition. A racing classic ski, which is long and narrow will be faster in machined groomed "tracks" but may sink under fresh snow and be slow and difficult. While a touring classic ski that is wider and short will be more efficient in fresh ungroomed snow but may be slow and cumbersome in machined groomed tracks.
Classic and touring skis are fit at a different stiffness than skate skis because a classic or touring ski needs to both glide and kick.
Wax and Waxless Classic Skis
Waxable Classic Skis
A Waxable Classic ski can be used in all types of snow conditions and when waxed properly will be the fastest and most efficient option. Waxable Classic skis use kick or "grip" wax on the base of the ski under and in front of the skier's foot (kick zone) and glide wax on the tips and tails. Most Nordic ski racers prefer to use waxable skis because it gives when the ability to make an adjustment based on snow conditions and temperature.
Waxless Classic Skis
A Waxless Classic ski is a popular option because they do not require a lot of maintenance to perform efficiently. A waxless classic ski may use a fish scale or crown pattern or skin material in the "kick zone" which allows the skier to grip the snow and glide the other ski forward. Waxless Classic skis provide grip in a variety of snow conditions, making them the best option for the skier who wants to "grab and go" and not worry about waxing.
Note: You can still wax the glide zones of your waxless classic ski with glide wax, this will allow the ski to glide faster and further.
Adult Cross Country Skate Ski Size Chart
| Skier Weight | Classic Ski Length | Skate Ski Length | Touring Ski Length |
| 100 - 110 lbs | 180 - 190 cm | 170-180 cm | S |
| 110 - 120 lbs | 182 - 192 cm | 172-182 cm | S |
| 120 - 130 lbs | 185 - 195 cm | 175-185 cm | S |
| 130 - 140 lbs | 187 - 200 cm | 177-187 cm | M |
| 140 - 150 lbs | 190 - 205 cm | 180-190 cm | M |
| 150 - 160 lbs | 195 - 210 cm | 185-195 cm | L |
| 160 - 180 lbs | 200 - 210 cm | 190+ cm | L |
| >180 lbs | 200 - 210 cm | 190+ cm | XL |
Kids Ski Sizing
| Kids Skate | Kids Classic |
| Skier Height (inches) | Ski Size (cm) | Skier Height (inches) | Ski Size (cm) |
| 45 - 50" | 120 - 130 | 30" | 90 - 100 |
| 50 - 55" | 130 - 140 | 30 - 35" | 100 - 110 |
| 55 - 60" | 140 - 150 | 35 - 40" | 110 - 120 |
| 60 - 65" | 150 - 160 | 40 - 45" | 120 - 130 |
| 65 - 70" | 160 - 170 | 45 - 50" | 130 - 140 |
| 50 - 55" | 140 - 150 | ||
| 55 - 60" | 150 - 160 | ||
| 60 - 65" | 160 - 170 | ||
| 65 - 70" | 170 - 180 |
